Answer:
See explanation below.
Step-by-step explanation:
The prime numbers are bold:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
18 19 20 21 22 23 24 25 26 27 28 29 30 31
a) We can see that as we go higher, twin primes seem less frequent but even considering that, there is an infinite number of twin primes. If you go high enough you will still eventually find a prime that is separated from the next prime number by just one composite number.
b) I think it's interesting the amount of time that has been devoted to prove this conjecture and the amount of mathematicians who have been involved in this. One of the most interesting facts was that in 2004 a purported proof (by R. F. Arenstorf) of the conjecture was published but a serious error was found on it so the conjecture remains open.
Review the following inferences and tell me if you consider them valid conclusions one can draw from the give information. i. If the moon is made of green cheese, then cows jump over it. The moon is made of green cheese, Therefore, cows jump over the moon. ii. If Socrates was a philosopher then he wasn't a historian. Socrates wasn't a historian. So, Socrates was a philosopher. Note: I may not grade this question. The only reason you are asked to solve them is for me to get a feel for the mathematical maturity of the members of this class.
The validity of the conclusion (Socrates was a philosopher) does not necessarily follow from the premises because there could be other reasons for Socrates not being a historian.
Let's analyze each inference:
Inference i:
If the moon is made of green cheese, then cows jump over it. The moon is made of green cheese, Therefore, cows jump over the moon.
This inference is an example of a valid logical argument known as modus ponens, a form of deductive reasoning. The structure can be broken down as follows:
Premise 1: If the moon is made of green cheese, then cows jump over it.
Premise 2: The moon is made of green cheese.
Conclusion: Therefore, cows jump over the moon.
Since both premises are assumed to be true, the conclusion logically follows.
Inference ii:
If Socrates was a philosopher then he wasn't a historian. Socrates wasn't a historian. So, Socrates was a philosopher.
This inference is an example of the logical fallacy known as affirming the consequent. Even though the conclusion might be true, the argument's structure is invalid. The structure can be broken down as follows:
Premise 1: If Socrates was a philosopher then he wasn't a historian.
Premise 2: Socrates wasn't a historian.
Conclusion: So, Socrates was a philosopher.
Here, the validity of the conclusion (Socrates was a philosopher) does not necessarily follow from the premises because there could be other reasons for Socrates not being a historian.
Show that a sequence {sn} coverages to a limit L if and only if the sequence {sn-L} coverages to zero.
Step-by-step explanation:
To prove this we can use the definition of a sequence converging to its limit, in terms of epsilon:
The sequence [tex] \{ S_n\}[/tex] converges to [tex]L[/tex]
if and only if
for every [tex]\epsilon >0[/tex] there exists [tex]n_0\in \mathbb{N}[/tex] such that
[tex] n>n_0 \implies |S_n-L|<\epsilon[/tex]
if and only if
for every [tex]\epsilon >0[/tex] there exists [tex]n_0\in \mathbb{N}[/tex] such that [tex] n>n_0 \implies |(S_n-L) - 0|<\epsilon[/tex]
if and only if
the sequence [tex]\{S_n-L\}[/tex] converges to 0.
Find the expansion of tan x about the point X = 0.
Answer:
[tex]f(x) = x +\frac{1}{3}x^{3}+....[/tex]
Step-by-step explanation:
As per the question,
let us consider f(x) = tan(x).
We know that The Maclaurin series is given by:
[tex]f(x) = f(0) + \frac{f^{'}(0)}{1!}\cdot x+ \frac{f^{''}(0)}{2!}\cdot x^{2}+\frac{f^{'''}(0)}{3!}\cdot x^{3}+......[/tex]
So, differentiate the given function 3 times in order to find f'(x), f''(x) and f'''(x).
Therefore,
f'(x) = sec²x
f''(x) = 2 × sec(x) × sec(x)tan(x)
= 2 × sec²(x) × tan(x)
f'''(x) = 2 × 2 sec²(x) tan(x) tan(x) + 2 sec²(x) × sec²(x)
= 4sec²(x) tan²(x) + 2sec⁴(x)
= 6 sec⁴x - 4 sec² x
We then substitute x with 0, and find the values
f(0) = tan 0 = 0
f'(0) = sec²0 = 1
f''(0) = 2 × sec²(0) × tan(0) = 0
f'''(0) = 6 sec⁴0- 4 sec² 0 = 2
By putting all the values in the Maclaurin series, we get
[tex]f(x) = f(0) + \frac{f^{'}(0)}{1!}\cdot x+ \frac{f^{''}(0)}{2!}\cdot x^{2}+\frac{f^{'''}(0)}{3!}\cdot x^{3}+......[/tex]
[tex]f(x) = 0 + \frac{1}{1}\cdot x+ \frac{0}{2}\cdot x^{2}+\frac{2}{6}\cdot x^{3}+......[/tex]
[tex]f(x) = x +\frac{1}{3}x^{3}+....[/tex]
Therefore, the expansion of tan x at x = 0 is
[tex]f(x) = x +\frac{1}{3}x^{3}+....[/tex].
Design a logic circuit to take input signals P, Q, and R and output a 1 if , and only if, P and Q have the same value and Q and R have opposite values.
Step-by-step explanation:
We have 3 given inputs namely P, Q, R and we have to draw a logic circuit which will give the output 1 if , and only if, P and Q have the same value and Q and R have opposite values.
So, first of all we make a truth table for this
P Q R Output(Y)
0 0 0 0
0 0 1 1
0 1 0 0
0 1 1 0
1 0 0 0
1 0 1 0
1 1 0 1
1 1 1 0
From the truth table we can see that the output, Y can be given by
[tex]Y=\bar{P}\bar{Q}R+PQ\bar{R}[/tex]
So, the logic circuit for the given logic equation can be drawn as shown fig.
To design a logic circuit that outputs a 1 if, and only if, P and Q have the same value and Q and R have opposite values, use XOR and AND gates in a specific configuration.
Explanation:To design a logic circuit that outputs a 1 if, and only if, P and Q have the same value and Q and R have opposite values, we can use logic gates. Here's the step-by-step design:
Use an XOR gate to determine if P and Q have opposite values. Connect P and Q to the inputs of the XOR gate.Use another XOR gate to determine if Q and R have opposite values. Connect Q and R to the inputs of this second XOR gate.Connect the outputs of both XOR gates to the inputs of an AND gate. This AND gate will output a 1 only if both inputs are 1.Thus, the logic circuit will output a 1 if, and only if, P and Q have the same value and Q and R have opposite values.
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g A four-input digital circuit is used to detect whether the resulting product of two two-bits numbers is greater or equal than 3. Consider that the two-bit numbers are given as the inputs BA and DC. So, your design will implement a function X (D, C, B, A) that is "0" if the product of BA X DC is less than 3 and "1" if it is greater or equal than 3. For example if your inputs are (D, C, B, A) = 1010, then the result value is "1" (X (D, C, B, A) =1), since BA =10 (210 ) and DC =10 (210)and the product will be 4, which is greater or equal than 3. On the other hand, if for example, (D, C, B, A) = 1001 then (X (D, C, B, A)=0), since BA =01 (110) and DC =10 (210) with a product equals to 2. The minterm expression for the function X (D, C, B, A) is:
Answer:
Tthe minterm expression for the function X is:
X = B'ADC + BA'DC' + BA'DC + BAD'C + BADC' + BADC
(The character ' refers to the complement of the variable)
Step-by-step explanation:
It is important to know that a minterm refers to a product of all variables that have a result of 1 in the truth table. The variables can be with or without complement. For example, consider the following truth table:
A, B, F
0, 0, 0
0, 1, 0
1, 0, 0
1, 1, 1
According to the previous truth table, the minterm would the row that F equals 1. In this case, when A and B are 1, F is 1. So, the variables are used directly (without complement). The minterm is: F = AB
Now, according to the problem, the truth table is presented below. The idea is to complete the X column which is '0' if the product BA x DC is less than 3 and is '1' if the product BA x DC is greater or equal than 3.
B, A, D, C, X0, 0, 0, 0, 0 (0x0=0)0, 0, 0, 1, 0 (0x1=0)0, 0, 1, 0, 0 (0x2=0)0, 0, 1, 1, 0 (0x3=0)0, 1, 0, 0, 0 (1x0=0)0, 1, 0, 1, 0 (1x1=1)0, 1, 1, 0, 0 (1x2=2)0, 1, 1, 1, 1 (1x3=3)1, 0, 0, 0, 0 (2x0=0)1, 0, 0, 1, 0 (2x1=2)1, 0, 1, 0, 1 (2x2=4)1, 0, 1, 1, 1 (2x3=6)1, 1, 0, 0, 0 (3x0=0)1, 1, 0, 1, 1 (3x1=3)1, 1, 1, 0, 1 (3x2=6)1, 1, 1, 1, 1 (3x3=9)The idea is to get the rows that have '1' in the X column. The minterms are are: 8, 11, 12, 14, 15 and 16. The minterm is composed by the four variables. To indicate a '1' just put the letter. To indicate a '0' put a letter with this character: '. For example, the row 8 would be B'ADC, because B is '0' and the others are '1'. The total minter expression is:
X = 'minterm 8' + 'minterm 11' + 'minterm 12' + 'minterm 14' + 'minterm 15' + 'minterm 16'
X = B'ADC + BA'DC' + BA'DC + BAD'C + BADC' + BADC
Thus, the minterm expression for the function X is:
X = B'ADC + BA'DC' + BA'DC + BAD'C + BADC' + BADC
Use the compound interest formula to compute the total amount accumulated and the interest earned $4500 for 3 years at 5% compounded quarterly The total amount accumulated after 3 years is $5223.40 (Round to the nearest cent as needed.) The amount of interest earned is $ (Round to the nearest cent as needed.)
To compute the total amount accumulated with compound interest and the interest earned, we utilize the formula for compound interest on the given principal amount, rate of interest, and the period. The interest earned is then computed by subtracting the initial principal amount from the total accumulated amount.
Explanation:The subject of this question is the calculation of compound interest. Given that the principal amount is $4500, the rate of interest is 5%, and the interest is compounded quarterly over a course of 3 years, we first need to compute the total amount accumulated. Using the formula for compound interest:
A = P (1 + r/n)^(nt)
where:
A is the amount of money accumulated after n years, including interest.
P is the principal amount (the initial amount of money).
r is the annual interest rate (in decimal).
n is the number of times that interest is compounded per year.
t is the number of years the money is invested for.
In this case, P = 4500, r = 0.05 (5% expressed as a decimal), n = 4 (since interest is compounded quarterly), and t = 3. Substituting these values into the formula, we get the total accumulated amount.
The interest earned can subsequently be found by subtracting the original principal amount (P) from the accumulated amount (A).
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In the 2000 Sydney Olympics, a special program initiated by IOC president Juan Antonio Samaranch allowed developing countries to send athletes to the Olympics without the usual qualifying procedure. Here are the 71 times for the first round of the 100 meter men’s swim (in seconds).60.39 49.93 53.40 51.82 50.46 51.36 50.28 50.19 52.1450.56 52.72 50.95 49.74 49.16 52.57 52.53 52.09 52.4049.75 54.06 53.50 50.63 51.93 51.62 52.58 53.55 51.0749.76 49.73 50.90 59.26 49.29 52.78 112.72 49.79 49.8352.43 51.28 52.22 49.76 49.70 52.90 50.19 54.33 62.4551.93 52.24 52.82 50.96 48.64 51.11 50.87 52.18 54.1250.49 49.84 52.91 52.52 50.32 51.52 52.00 52.85 52.2449.45 51.28 49.09 58.79 49.74 49.32 50.62 49.45Calculate the sample mean and sample standard deviation(use Excel functions).
Answer:
The means for times for the first round of the 100 meter men’s swim is 52.64789 seconds
The satandar deviation for times for the first round of the 100 meter men’s swim is 7.60182 seconds
Step-by-step explanation:
The sample mean for a set of n data is given by:
[tex]\bar X = \frac{1}{n}\sum{x_i}[/tex]
In other words, the sample mean of the times for 71 times of the first round measured in seconds is:
[tex]\bar X = \frac{1}{71}\sum{x_i} = 52.64789[/tex] seconds
The sample standard deviation for a set of n data is given by:
[tex]S = \sqrt{\frac{1}{n-1}\sum{(x_i - \bar x)^2}}[/tex]
In other words, the sample standard deviation of the times for 71 times of the first round measured in seconds is:
[tex]S = \sqrt{\frac{1}{n-1}\sum{(x_i - \bar x)^2}} = 7.60182[/tex] seconds
A bag contains four red marbles, two green ones, one lavender one, three yellows, and one orange marble. HINT (See Example 7.] How many sets of four marbles include none of the red ones?
Answer: 35
Step-by-step explanation:
Given : A bag contains four red marbles, two green ones, one lavender one, three yellows, and one orange marble.
Total = 4+2+1+3+1=11
To find sets of four marbles include none of the red ones, we need to exclude red marbles when we count the total number of marbles.
Then, the total marbles(exclude red) =11-4=7
Now, the combination of 7 marbles taking 4 at a time is given by :-
[tex]^7C_4=\dfrac{7!}{4!(7-4)!}=\dfrac{7\times6\times5\times4!}{4!3!}=35[/tex]
Hence, the number of sets of four marbles include none of the red ones = 35
In preparing a certain ointment, a pharmacist used 28.35 g of zinc oxide instead of the 31.1 g called for. Calculate the percentage of error on the basis of the desired quantity.
Answer: 9.70%
Step-by-step explanation:
The formula to find the percentage error is given by :-
[tex]\%\text{ error}=\dfrac{|\text{Estimate-Actual}|}{\text{Actual}}\times100[/tex]
Given : Actual mass of zinc oxide used by pharmacist = 28.35 g
Estimated mass of zinc oxide used by pharmacist =31.1 g
Now, [tex]\%\text{ error}=\dfrac{|31.1-28.35|}{28.35}\times100[/tex]
i.e. [tex]\%\text{ error}=\dfrac{2.75}{28.35}\times100[/tex]
i.e. [tex]\%\text{ error}=9.70017636684\approx9.70\%[/tex]
Hence, the percentage of error on the basis of the desired quantity.= 9.70%
Write down a fraction whose value lies between 3 and 4; whose denominator is a multiple of 5; whose numerator is a multiple of 11, and whose denominator is less than 17. How many can you find? This may look hard, so instead, try the following sequence derived from it: Write down a fraction whose value lies between 3 and 4. Write down a fraction whose value lies between 3 and 4 and whose denominator is a multiple of 5; find a way to write down all such fractions.
Answer:
33/10 and 55/15
Step-by-step explanation:
Possible denominators that are multiples of 5 less than 17 are 5, 10, 15.
Corresponding numerator ranges are [15, 20], [30, 40], and [45, 60]. In only two of these ranges are there any multiples of 11.
33 in [30, 40]
55 in [45, 60]
So, there are only two possible fractions meeting your requirement:
33/10 and 55/15
Convert one hour to seconds
Answer: 3600 seconds
Step-by-step explanation:
Use the following conversions: 1 hour = 60 minutes & 1 minute = 60 seconds
[tex]1\ hour \times \dfrac{60\ minutes}{1\ hour}\times \dfrac{60\ seconds}{1\ minute}\quad =\large\boxed{3600\ seconds}[/tex]
Consider a colony of E.Coli bacteria that is growing exponentially. A microbiologist finds that, initially, 1,000 bacteria are present and 50 minutes later there are 10,000 bacteria. a) Find expression for the number of bacteria Q(t) after t minutes. b) When will there be 1,000,000 bacteria?
Answer: a) [tex]N(t) = 10^3\exp(0.046\frac{1}{min}t)[/tex]
b) 1,000,000 bacteria at t = 150 min
Step-by-step explanation:
Hi!!
A colony that grows exponentially has a number of bacteria:
[tex]N(t) = N_0 \exp(\lambda t)[/tex]
In this case at time t = 0:
[tex]N(0)=N_0=10^3[/tex]
We need to find the value of λ. We use the data:
[tex]N(t=50\;min)10^4 = 10^3\exp(\lambda \;50\;min)[/tex]
[tex]ln(10)=2.3=\lambda\;50\;min\\\lambda= \frac{0.046}{min}\\N(t) = 10^3\exp(\frac{0.046}{min}t)\\[/tex]
To find when there will be 1,000,000 bacteria:
[tex]10^6=10^3\exp(\frac{0.046}{min}t)[/tex]
[tex]\ln(10^3)=3\ln(10) = \frac{0.046}{min}t[/tex]
[tex]t = 150\;min [/tex]
An inhalation aerosol contains 225 mg of metaproterenol sulfate, which is sufficient for 300 inhalations. How many micrograms of metaproterenol sulfate would be contained in each inhalation?
Answer:
Each inhalation has 750 micrograms of metaproterenol sulfate.
Step-by-step explanation:
First step: How many miligrams are there in each inhalation.This can be solved by a rule of three problem.
In a rule of three problem, the first step is identifying the measures and how they are related, if their relationship is direct of inverse.
When the relationship between the measures is direct, as the value of one measure increases, the value of the other measure is going to increase too.
When the relationship between the measures is inverse, as the value of one measure increases, the value of the other measure will decrease.
In this step, our measures are:
- The number of inhalations.
- The quantity inhaled.
As the number of inhalations increases, so does the quantity inhaled. This means that this is a direct rule of problem.
300 inhalations contains 225mg of metaproterenol sulfate. How many miligrams are in a inhalation?
300 inhalations - 225mg
1 inhalation - xmg
300x = 225
[tex]x = \frac{225}{300}[/tex]
x = 0.75mg
Each inhalation has 0.75mg of metaproterenol sulfate.
Final step: Conversion of 0.75mg to micrograms.
Each mg has 1000 micrograms. So:
1mg - 1000 micrograms
0.75mg - x micrograms
x = 1000*0.75
x = 750 micrograms
Each inhalation has 750 micrograms of metaproterenol sulfate.
To find out how many micrograms of metaproterenol sulfate are contained in each inhalation, convert the total milligrams to micrograms, then divide by the total number of inhalations. Thus, each inhalation contains 750 μg of metaproterenol sulfate.
Explanation:The problem requires conversion of milligrams (mg) to micrograms (μg) which will allow for the calculation of the amount of metaproterenol sulfate in each inhalation. It is important to know that 1 mg is equal to 1000 μg. Hence, 225 mg of metaproterenol sulfate is equal to 225,000 μg (225 X 1000). To find out how many micrograms are in each inhalation, divide the total number of micrograms (225,000 μg) by the total number of inhalations (300). Hence, each inhalation contains 750 μg of metaproterenol sulfate.
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Is the following relation a function?
Yes
No
Answer: This represents a function
Step-by-step explanation: In this problem, we are given a relation in the form of a mapping diagram and we are asked if it represents a function. The easiest way to do this problem is to first translate the mapping diagram into a list of ordered pairs.
(6,-2) (-2,2) (4,1) (-1,1)
Now to determine if the relation is a function, we can simply look at the x coordinates of each ordered pair. Notice that all of them are different so the relation must be a function. It's important to understand that even though two of the Y coordinates are the same, this relation is still a function because the y coordinates do not have any effect on whether or not the relation is a function.
The area of a surface can be measured in units of square meters (m^2). Which of the following combinations of units could not be used to measure area?
a)m.cm
b)ft^3/m^2
c)in^2
d)m.ft
e)ft^3/m
Answer:
Option B is the answer.
Step-by-step explanation:
The area of a surface can be measured in square meter (meter²).
Square meter means its a multiplication of two lengths measured in meter.
Option A.
m.cm = unit of length × unit of length
So we can measure the area by this unit.
Option B.
[tex]\frac{ft^{3} }{m^{2} }[/tex]
Since ft³ is a unit of volume and m² of area. When we divide these units we get the unit of length.
Therefore, we can not measure the area by this unit.
Option C.
Inch² = unit of length × unit of length
So we can measure the area by this unit.
Option D.
m.ft = Unit of length × unit of length
Which shows its a unit of area.
Option E.
[tex]\frac{ft^{3} }{m}[/tex] = [tex]\frac{\text{Unit of volume}}{\text{Unit of length}}[/tex]
= unit of area
Therefore, we can use this unit to measure the area.
Option B. is the answer.
Determine whether the following possible responses should be classified as interval, nominal or ordinal data.
? Ordinal Nominal Interval 1. Heidi's favorite brand of tennis balls
? Ordinal Nominal Interval 2. Number of cars in a parking lot
? Ordinal Nominal Interval 3. Amount of time you spend per week on your homework
? Ordinal Nominal Interval 4. Whether you are a US citizen
Answer:
1. Nominal data 2. Responses here can't be classified as interval or nominal or ordinal data 3. Responses here can't be classified as interval or nominal or ordinal data 4. nominal
Step-by-step explanation:
1. Heidi's favorite brand of tenis balls is only a "label" in the set of brands that can be regarded. So, because we are dealing with names or "labels" we should classify responses here as nominal data.
2. Possible values for the number of cars in a parking lot are 0, 1, 2, 3, 4,... Besides we can say that 4 cars is twice than 2 cars, and exist a true zero. We can't say that responses here correspond to interval data, in fact, we can say that responses here correspond to the kind of data called ratio data.
3. You can spend zero hours in your homework, so, there exists an absolute zero, besides, to say that you spend 4 hours in your homework is twice that if you spend 2 hours in your homework is meaningful. We can't classify responses here as interval data or ordinal or nominal. We can classify responses here as ratio data.
4. There are only two different responses here, i.e., You are a US citizen or You are not a US citizen. We are dealing with "labels" again, and in general, we can't say there is a better response or stablish an order.
Final answer:
The correct classifications are: Heidi's favorite brand of tennis balls (Nominal), Number of cars in a parking lot (Nominal, with an explanation), Amount of time spent on homework per week (Interval), and Whether you are a US citizen (Nominal).
Explanation:
To determine whether the listed responses should be classified as interval, nominal, or ordinal data, it is essential to understand what each type of data signifies. Nominal data are categories without any order, ordinal data have a meaningful order or ranking but not necessarily consistent differences between rankings, and interval data have a consistent scale and order, but no true zero point.
Nominal: Heidi's favorite brand of tennis balls. This is a category (brand) without a numerical value or order.
Nominal: Number of cars in a parking lot. Although it involves numbers, it is essentially counting the frequency of an item, which falls under ratio data. However, as the question specifically asks among nominal, ordinal, and interval, the correct identification in this context is not provided.
Interval: Amount of time you spend per week on your homework. Time has a consistent scale and can be ordered, but there is no true zero time (you cannot have negative time).
Nominal: Whether you are a US citizen. This is a categorical variable with no inherent order.
If the shape of our data set is multimodal, we expect:
(A) the mean to be less than the median.
(B) the mean to be larger than the median.
(C) the mean and the median to be approximately the same.
(D) none of the these.
Answer: (D) none of the these.
Step-by-step explanation:
A multimodal distribution refers to a distribution with two or more modes.If the shape of our data set is multimodal, the it will show two or more peaks which represents the number modes in the data.
Since it has no relation with mean or median of the data, there for the correct option will be "none of these".
In a multimodal distribution, the relationship between the mean and the median cannot be determined without more information on the distribution's skewness and the relative size of the peaks. Thus, the answer is that none of the provided options are necessarily correct.
Explanation:When dealing with a multimodal distribution, which is a distribution with more than one peak or "mode," the relationship between the mean, the median, and the mode is not as predictable as it is in symmetric distributions. Since multimodal distributions can have multiple peaks at different points, it can alter the typical order of the mean, median, and mode based on where these peaks occur relative to each other.
The presence of multiple modes can pull the mean toward the larger values if one peak represents higher values significantly, or it can pull the mean towards lesser values if a peak represents lower values significantly. However, without additional specific information about the skewness or the relative size of these peaks, we cannot definitively say whether the mean will be less than, equal to, or greater than the median. Therefore, the correct answer is:
(D) none of these.
In a 4-digit number, the first two digits are both 2. The sum of the ones and tens digits is14. What numbera are possible.
Answer:
2295, 2286, 2277, 2268, 2259
Step-by-step explanation:
We are dealing with a number of 4 digits, whose first two digits are 2's. So the number looks like [tex]2~2~ d_2 ~d_1[/tex] (where the last 2 digits are to be determined).
The exercise says that the sum of the ones and tens digits is 14. The ones digit is the last digit (the right most digit, which we are denoting by [tex]d_1[/tex]), and the tens digit is the second right most digit (which we are denoting by [tex] d_2[/tex]). So [tex] d_1+d_2=14[/tex]
Since they're digits, their only possible values are 0,1,2,3,4,5,6,7,8,9.
If d1 was 0, d2 would have to be 14 (since they should add up to 14), which is impossible.
If d1 was 1, d2 would have to be 13 (since they should add up to 14), which is impossible.
If d1 was 2, d2 would have to be 12, which is impossible.
And so going through all possibilities, we get that the only possible ones are:
[tex] d1=5~ and~ d_2=9[/tex]
[tex] d1=6~ and~ d_2=8[/tex]
[tex] d1=7~ and~ d_2=7[/tex]
[tex] d1=8~ and~ d_2=6[/tex]
[tex] d1=9~ and~ d_2=5[/tex]
And so the possible 4-digits numbers are 2295, 2286, 2277, 2268, 2259.
Assume that the sales of a certain appliance dealer can be approximaed y sraig were $6000 in 1982 and $ 64,000 in 1987. Let x - O represent 1982 Find the equation giving yearly alesSand then use it to predict the yearly sales in 1990.
Answer:
[tex]y=11,600x+6,000[/tex]
Yearly sales in 1990: $98,800.
Step-by-step explanation:
We have been given that the sales of a certain appliance dealer can be approximated by a straight line. Sales were $6000 in 1982 and $ 64,000 in 1987.
If at 1982, [tex]x=0[/tex] then at 1987 x will be 5.
Now, we have two points (0,6000) and (5,64000).
[tex]\text{Slope}=\frac{64,000-6,000}{5-0}[/tex]
[tex]\text{Slope}=\frac{58,000}{5}[/tex]
[tex]\text{Slope}=11,600[/tex]
Now, we will represent this information in slope-intercept form of equation.
[tex]y=mx+b[/tex], where,
m = Slope,
b = Initial value or y-intercept.
We have been given that at [tex]x=0[/tex], the value of y is 6,000, so it will be y-intercept.
Substitute values:
[tex]y=11,600x+6,000[/tex]
Therefore, the equation [tex]S=11,600x+6,000[/tex] represents yearly sales.
Now, we will find difference between 1990 and 1982.
[tex]1990-1982=8[/tex]
To find yearly sales in 1990, we will substitute [tex]x=8[/tex] in the equation.
[tex]S=11,600(8)+6,000[/tex]
[tex]S=92,800+6,000[/tex]
[tex]S=98,800[/tex]
Therefore, the yearly sales in 1990 would be $98,800.
A particular sale involves four items randomly selected from
alarge lot that is known to contain 10% defectives. Let Y denote
thenumber of defectives among the four sold. The purchaser of
theitems will return the defectives for repair, and the repair cost
isgiven by C = 3Y^2 + Y + 2. Find the expected repair cost.
Answer:
The expected repair cost is 3.96.
Step-by-step explanation:
Given :A particular sale involves four items randomly selected from a large lot that is known to contain 10% defectives.
The purchaser of the items will return the defectives for repair, and the repair cost is given by[tex]C = 3Y^2 + Y + 2[/tex]
To Find : Find the expected repair cost.
Solution:
We are given that A particular sale involves four items randomly selected from a large lot that is known to contain 10% defectives.
So, The probability of item being defected = 0.10
Let Y denote the number of defectives among the four sold.
It follows the binomial distribution.
n = 4 , p =0.10
[tex]E(Y)=np = 4 \times 0.10 =0.4[/tex]
[tex]V(Y)=np(1-p)=0.4(1-0.1)=0.36[/tex]
Now we know that [tex]V(Y)=E(Y^2)-[E(Y)]^2[/tex]
[tex]0.36=E(Y^2)-[0.4]^2[/tex]
[tex]0.36=E(Y^2)-0.16[/tex]
[tex]0.36+0.16=E(Y^2)[/tex]
[tex]0.52=E(Y^2)[/tex]
Now we are given an equation that represents the repair cost
[tex]C = 3Y^2 + Y + 2[/tex]
So, Expected repair cost = [tex]E(C) =E( 3Y^2 + Y + 2)[/tex]
[tex]E(C) =3E(Y^2) +E(Y) + 2[/tex]
[tex]E(C) =3 \times 0.52 +0.4+ 2[/tex]
[tex]E(C) =3.96[/tex]
Hence the expected repair cost is 3.96.
The expected number of defectives is 0.4, and using the formula, we find the expected repair cost to be 3.96 units.
To find the expected repair cost, we first need to determine the expected value of the number of defectives, denoted by Y. Since the probability of a defective item is 10% (or 0.1), Y follows a binomial distribution with parameters n = 4 and p = 0.1. The expected value of a binomial random variable is given by E(Y) = np. Hence, the expected number of defectives is E(Y) = 4 × 0.1 = 0.4.
The repair cost is given by the formula C = 3Y² + Y + 2. To find the expected repair cost, we need to calculate E(C). This involves finding E(3Y² + Y + 2).
Using the linearity of expectation:
E(C) = E(3Y² + Y + 2)E(C) = 3E(Y²) + E(Y) + E(2)E(C) = 3E(Y²) + 0.4 + 2We already have E(Y) = 0.4. Next, we need to compute E(Y²). For a binomial random variable, E(Y²) can be found using the formula E(Y²) = Var(Y) + [E(Y)]². The variance of a binomial random variable is given by Var(Y) = np(1-p). Thus, Var(Y) = 4 × 0.1 × 0.9 = 0.36.
Thus, E(Y²) = 0.36 + (0.4)² = 0.36 + 0.16 = 0.52.
Putting it all together:
E(C) = 3 × 0.52 + 0.4 + 2E(C) = 1.56 + 0.4 + 2E(C) = 3.96Therefore, the expected repair cost is 3.96 units.
what is the reason for each step in the solution of the equation? -6x = -2(x + 12) ? Drag and drop the reasons into the boxes to correctly complete the table.
Answer:
GivenDistributive propertyAddition propertyDivision propertyStep-by-step explanation:
In step 2, the result of eliminating parentheses is shown. That is done by using the distributive property to multiply -2 by each of the terms inside parentheses, giving ...
(-2)(x) +(-2)(12) = -2x -24
In step 3, 2x is added to both sides of the equation. This eliminates the -2x term on the right, and increases the -6x term on the left to -4x.
In step 4, the equation is divided by -4. This makes the coefficient of x become 1.
The equation -6x = -2(x + 12) can be solved by distributing -2 to elements inside the bracket, re-writing the equation, simplifying it, and then finally solving for 'x', leading to x = 6.
Explanation:The equation shared is a linear equation in one variable, -6x = -2(x + 12). There are main steps to solving this equation:
Distribute the -2: First, distribute the '-2' to both 'x' and '+12' inside the bracket. So, this becomes -2x -24. Set equal to -6x: Now, re-write the equation: -6x = -2x - 24. Simplify: You'll add 2x to both sides of the equation to keep the equation balanced, leading to -4x = -24. Solve for x: Finally, divide both sides by -4 to isolate 'x'. This will result in x = 6.
So, for this equation -6x = -2(x + 12), the solution is x = 6.
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A liquid contains 0.25 mg of a substance per milliliter. How many grams of the substance will 3.5 L contain?
Answer:
3.5 of the liquid will contain 0.875g of the substance.
Step-by-step explanation:
The problem states that a liquid contains 0.25 mg of a substance per milliliter. And asks how many grams of the substance will 3.5 L contain.
First step: Conversion of 3.5L to ml
Each liter has 1000ml. So:
1L - 1,000mL
3.5L - xmL
x = 1,000*3.5
x = 3,500mL
Second step: How many miligrams are there in 3,500mL?
The problem states that each ml of the liquid contains 0.25mg of a substance. So
1ml - 0.25mg
3,500 mL - xmg
x = 3,500*0.25
x = 875mg
Final step: Conversion of 875mg to g.
Each g has 1000 mg. So
1g - 1000mg
xg - 875mg
1000x = 875
[tex]x = \frac{875}{1000}[/tex]
x = 0.875g
3.5 of the liquid will contain 0.875g of the substance.
To find the mass of the substance in 3.5 L, convert the volume to milliliters and then multiply by the concentration. The mass is 0.875 g.
Explanation:To find the number of grams of the substance, we need to convert from milliliters to liters and then use the given concentration of 0.25 mg/mL to find the mass.
First, we convert 3.5 L to milliliters by multiplying by 1000: 3.5 L x 1000 mL/L = 3500 mL.
Next, we multiply the volume in milliliters (3500 mL) by the concentration (0.25 mg/mL) to find the mass: 3500 mL x 0.25 mg/mL = 875 mg.
Finally, we convert the mass from milligrams to grams by dividing by 1000: 875 mg / 1000 = 0.875 g.
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A salesperson makes a five percent commission on every sale she makes. Her daily sales in dollars) for the past 16 working days were: 28 49 50 34 33 44 35 25 29 30 35 34 32 40 78 39. a) Find the 5 number summary and P30 b) Find the values of the standard deviation, range, and interquartile range (IQR). c) Are there any outliers? Explain!.
Answer:
Step-by-step explanation:
a. The five-number summary is made up of the following summary means:
1. Minimum: 25
2. First Quartile: 30.5
3. Medium: 34.5
4. Third quartile: 43
5. Maximum: 78
6. P30: 32.1
b.
Standard Deviation: 12.72
Rank: 53
Interquartile range: 12.5
C. The interquartile range is 12.5 and 1.5 times the interquartile range is (1.5) (12.5) = 18.75. Third quartile plus 1.5 times the interquartile range is 61.75. The value of 78 exceeds 61.75, then 78 is an outlier.
Find the average rate of change of the function below from x1 to x2.
f(x)=2x+7
from
x1=−1
to
x2=0
Question 9 options:
a)
2
b)
−12
c)
13
d)
-8
e)
none
Answer:
The average rate of change is 2, letter a)
Step-by-step explanation:
Given a function y, the average rate of change S of y=f(x) in an interval [tex][x_{s}, x_{f}][/tex] will be given by the following equation:
[tex]S = \frac{f(x_{f}) - f(x_s)}{x_{f} - x_{s}}[/tex].
In our problem, we have that:
[tex]f(x) = 2x + 7[/tex]
[tex]x_{s} = -1[/tex]
[tex]x_{f} = 0[/tex]
So:
[tex]f(x_{s}) = f(-1) = 2(-1) + 7 = -2 + 7 = 5[/tex]
[tex]f(x_{f}) = f(0) = 2(0) + 7 = 0 + 7 = 7[/tex]
The average rate of change is:
[tex]S = \frac{f(x_{f}) - f(x_s)}{x_{f} - x_{s}} = \frac{7-5}{0 -(-1)} = \frac{2}{1} = 1[/tex]
The average rate of change is 2, letter a)
Answer:
wala akong alam jun
Step-by-step explanation:
i hate math, mathuloggggggg ka, ayieee ?luh asa ka
Two simple statements are Connected with a AND? Youre Censtructing the truth table of this compound statement. How many rows does the truth table will have?
Answer:
A truth table should consider all possible truth values of its simple statements. In this case there are two simple statements, where each one of them can take true or false value, so each of the estatements needs two rows for their individual truth values and, therefore, the compound estatement requires 2x2 = 4 rows for its truth table.
Step-by-step explanation:
Answer:
4 Rows
Step-by-step explanation:
Since, the number of input given to the AND gate in terms of simple statement, the output of the AND gate will give output true if both the statements given to the AND gate will true otherwise it will show output false.
Let's see the truth table for the inputs of two statements
Statement 1 Statement 2 Output
False False False
False True False
True False False
True True True
As we can see the number of rows in the truth table of an AND gate having two input, will have 4 rows.
Diff. / Original amount= % of increase or decrease
Answer:
% increase =[tex]\frac{\text{ Increased number -Original number }}{\text{Original number}} \times 100\%[/tex]
% decrease =[tex]\frac{\text{ Original number - Decreased number }}{\text{Original number}} \times 100\%[/tex]
Step-by-step explanation:
Percentage Increase:
Let there be an original number. If it increased to a certain value we can calculate the percentage increase value with the help of following formula:
% increase =[tex]\frac{\text{ Increased number -Original number }}{\text{Original number}} \times 100\%[/tex]
Percentage Decrease:
Let there be an original number. If it decreases to a certain value we can calculate the percentage decrease with the help of following formula:
% decrease =[tex]\frac{\text{ Original number - Decreased number }}{\text{Original number}} \times 100\%[/tex]
Angle A and Angle B are supplementary angles. The ratio of the measure of Angle A to the measure of Angle B is 5:4. Find the measures of Angle A and Angle B.
Measure of Angle A =
degrees.
Measure of Angle B =
degrees.
Answer:
Angle A = 100°
Angle B = 80°
Step-by-step explanation:
Supplementary angles sum 180°
Angle A to Angle B ratio is 5:4, you can write that ratio using a factor.
Angle A = 5x
Angle B = 4x
Since the sum is 180°
Angle A + Angle B = 180°
5x + 4x = 180°
9x = 180°
x = 20°
Replacing x = 20°
Angle A = 5(20°) = 100°
Angle B = 4(20°) 80°
Let P(x), Q(x), R(x) and S(x) denote the following predicates with domain Z:
P(x): x ≤ 0,
Q(x): x2 = 1,
R(x): x is odd
S(x): x = x + 1.
For each predicate, determine its truth value
Answer: Hi!, first, Z are the integer numbers, so we only will work with them.
P(x): x ≤ 0
ok, this predicate is true if x is less or equal tan 0, and false if x is greater than 0.
so P(x) is true if { x∈Z, x ≤ 0}
Q(x): x2 = 1
Q(x) is true only if 2*x = 1. now, this means that if x=1/2 is true, but 1/2 isnt an integer, then Q(x) is false ∀ x ∈ Z.
R(x): x is odd
R(x) is true if x is odd, we can write odd numbers as x = 2k + 1, where k is a random integer; then:
R(x) is true if x=2k +1, with k∈Z.
S(x): x = x + 1
S(x) is true if x= x+1, if we subtract x from both sides of the equality, we get that S(x) is true if 0=1, and this is absurd, then:
S(x) is false ∀ x ∈ Z.
if 4 divides a^2-3b^2, then at least one of the integers a and b is even.
Step-by-step explanation:
The proof can be done by contradiction. Suppose both a, and b weren't even. So that a, and b are both odd. This means they both look like
[tex]a=2k+1,~~b=2l+1[/tex] (for some integers k and l)
So, let's compute what [tex]a^2-3b^2[/tex] would be in this case:
[tex]a^2-3b^2=(2k+1)^2-3(2l+1)^2=4k^2+4k+1-3(4l^2+4l+1)[/tex]
[tex]= 4k^2+4k+1-12l^2-12l-3=4k^2+4k-12l^2-12l-2 [/tex]
[tex]=4(k^2+k+3l^2-3l)-2[/tex]
which notice wouldn't be divisible by 4. This shows then that since [tex]a^2-3b^2[/tex] is divisible by 4, at least one of the integers a and b is even.
If $1900 earned simple interest of $56.28 in 6 months, what was the simple interest rate? The simple interest rate is % (Do not round until the final answer. Then round to the nearest tenth as needed.)
Answer:
5.9%.
Step-by-step explanation:
We are asked to find the simple interest rate for an amount of $1900 which earned simple interest of $56.28 in 6 months.
We will use simple interest formula to solve our given problem.
[tex]I=Prt[/tex], where,
[tex]I=\text{Amount of interest}[/tex]
P = Principal amount,
r = Interest rate in decimal form,
t = Time in years.
6 months equals 1/2 (0.5) year.
Substituting given values:
[tex]\$56.28=\$1900\cdot r\cdot 0.5[/tex]
[tex]\$56.28=\$950\cdot r[/tex]
[tex]\frac{\$56.28}{\$950}=\frac{\$950\cdot r}{\$950}[/tex]
[tex]0.059242=r[/tex]
Switch sides:
[tex]r=0.059242[/tex]
Convert in percentage:
[tex]0.059242\times 100\%[/tex]
[tex]5.9242\%\approx 5.9\%[/tex]
Therefore, the simple interest rate is approximately 5.9%.
To calculate the simple interest rate, the given values are substituted into the formula for simple interest, which is then re-arranged to solve for the interest rate.
Explanation:To calculate the simple interest rate, you can use the simple interest formula: I = Prt where I is the interest earned, P is the principal amount (the initial amount of money), r is the rate of interest and t is time.
In this context, you earned $56.28 in 6 months from an initial amount of $1900. Re-arranging the formula to solve for r (the interest rate) we get: r = I / (Pt).
Substituting the given values into the formula, we find: r = $56.28 / ($1900 * 0.5). Carry out the calculations and multiply the result by 100 to get the percentage. This will yield your simple interest rate.
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