Answer: The predicted error is minimized.
Step-by-step explanation:
Ideally, residual analysis is used in a linear regression model to measure the appropriateness of the model by examining the residual plots on the graph.
And, residual referred as a difference between the noticed value of the dependent variable (y) and the estimated value (ŷ).
Residual = Noticed value - Estimated value
e = y - ŷ
Multiple regression analysis is used to make a linear model capable of giving predicting an output variable using two or more independent variables. Analysis of the residual is used to to test if the variation in the residuals is the same for all predicted values of y.
Residual values gives the difference between the actual and predicted value of a model. Residual analysis in linear regression is used to test the appropriateness of a linear model for a given data set. Since, the number of independent variables in multiple regression exceeds 1 ; then variation in the predicted values are analysed using the result of the residuals.Therefore, residual analysis in multiple regression tests the variation in the residuals is the same for all predicted values of y.
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Use induction to prove that 2? ?? for any integer n>0 . Indicate type of induction used.
I proved the base case using n = 1, and for my induction hypothesis, I said that we assume n = k for 2^k > k, but I am stuck trying to get to n = k + 1.
So far I have:
2^k > k
2*2^k > 2*k
2^{k+1} > 2k
Answer with explanation:
The given statement is which we have to prove by the principal of Mathematical Induction
[tex]2^{n}>n[/tex]
1.→For, n=1
L H S =2
R H S=1
2>1
L H S> R H S
So,the Statement is true for , n=1.
2.⇒Let the statement is true for, n=k.
[tex]2^{k}>k[/tex]
---------------------------------------(1)
3⇒Now, we will prove that the mathematical statement is true for, n=k+1.
[tex]\rightarrow 2^{k+1}>k+1\\\\L H S=\rightarrow 2^{k+1}=2^{k}\times 2\\\\\text{Using 1}\\\\2^{k}>k\\\\\text{Multiplying both sides by 2}\\\\2^{k+1}>2k\\\\As, 2 k=k+k,\text{Which will be always greater than }k+1.\\\\\rightarrow 2 k>k+1\\\\\rightarrow2^{k+1}>k+1[/tex]
Hence it is true for, n=k+1.
So,we have proved the statement with the help of mathematical Induction, which is
[tex]2^{k}>k[/tex]
Questions (no partial grades if you don't show your work) 1. In a group of 6 boys and 4 girls, four children are to be selected. In how many diffeest weys ces they be selected if at least one boy must be there
Answer:
Total number of ways will be 209
Step-by-step explanation:
There are 6 boys and 4 girls in a group and 4 children are to be selected.
We have to find the number of ways that 4 children can be selected if at least one boy must be in the group of 4.
So the groups can be arranged as
(1 Boy + 3 girls), (2 Boy + 2 girls), (3 Boys + 1 girl), (4 boys)
Now we will find the combinations in which these arrangements can be done.
1 Boy and 3 girls = [tex]^{6}C_{1}\times^{4}C_{3}=6\times4[/tex]=24
2 Boy and 2 girls=[tex]^{6}C_{2}\times^{4}C_{2}=\frac{6!}{4!\times2!}\times\frac{4!}{2!\times2!}=15\times6=90[/tex]
3 Boys and 1 girl = [tex]^{6}C_{3}\times^{4}C_{1}=\frac{6!}{4!\times2!}\times\frac{4!}{3!}=\frac{6\times5\times4}{3 \times2} \times4=80[/tex]
4 Boys = [tex]^{6}C_{4}=\frac{6!}{4!\times2!} =\frac{6\times 5}{2\times1}=15[/tex]
Now total number of ways = 24 + 90 + 80 + 15 = 209
In order to compare two scales, 30 objects are weighed on both scales. Each object would then have two weight values (one from scale 1 and one from scale 2). Based on the nature of the differences in the two weight measurements for the 30 objects, the two scales may be compared. Do these samples represent dependent or independent samples? A. dependent samples. B. independent samples.
Answer:
These two samples are independent samples.
Step-by-step explanation:
Each object would then have two weight values (one from scale 1 and one from scale 2). Based on the nature of the differences in the two weight measurements for the 30 objects, the two scales may be compared.
These two samples are independent samples.
Though the objects are same but the scales are different.
John took all his money from his savings account. He spent $110 on a radio and 4/11 of what was left on presents for his friends. John then put 2/5 of his remaining money into a checking account and donated the $420 that was left to charity. How much money did John originally have in his savings account?
Answer:
$1210
Step-by-step explanation:
Let x be total amount
First John spent $110 on a radio and 4/11 of what was left on presents for his friends so he was left with
[tex]\frac{7}{11}(x-110)=\frac{7}{11}x-70[/tex]
Then he put 2/5 of his remaining money into a checking account
[tex]\frac{3}{5}\left(\frac{7}{11}x-70\right)[/tex]
Rest he donated to charity
[tex]420=\frac{3}{5}\left(\frac{7}{11}x-70\right)\\\Rightarrow \left(\frac{7}{11}x-70\right)=\frac{2100}{3}\\\Rightarrow \frac{7}{11}x-70=700\\\Rightarrow \frac{7}{11}x=770\\\Rightarrow x=1210[/tex]
Hence total amount of money John originally had was $1210
Find i (the rate per period) and n (the number of periods) for the following loan at the given annual rate.
Annual payments of $3,600 are made for 12 years to repay a loan at 5.7% compounded annually.
i=
n=
Answer:
i = 5.7%
n = 12
Step-by-step explanation:
Compounded annually means once per year. So the rate per period is 5.7%, and the number of periods is 12.
Answer:
i = 5.7%
n = 12
Step-by-step explanation:
i (the rate per period) and n (the number of periods) for the following loan at the given annual rate.
Annual payments of $3,600 are made for 12 years to repay a loan at 5.7% compounded annually.
Therefore,
i = 5.7%
n = 12
9. An RSA cryptosystem has modulus n 391, which is a product of the primes 23 and 17. Which of the following is suitable as an encoding key e? (a) 163 (b) 353 (c) 351 (d) 277 (e) none of these. 10. Which of the following polynomials p(x) is complete over Zalr? (a) z4+1 (e) none of these
Answer:
163
Step-by-step explanation:
So n=391.
This means p=23 and q=17 where p*q=n.
[tex] \lambda (391)=lcm(23-1,17-1)=lcm(22,16)=2*8*11=16*11=176. [/tex]
We want to choose e so that e is between 1 and 176 and the gcd(e,176)=1.
There is only one number in your list that is between 1 and 176... Hopefully the gcd(163,176)=1.
It does. See notes below for checking it:
176=2(88)=2(4*22)=2(2)(2)(2)(11)
None of the prime factors of 176 divide 163 so we are good.
The answer is 163.
Find the first 2 terms of each of two power series solutions: y" + x^2 y'+ xy = 0
Apparently this solution is too long for posting, so I've written it elsewhere and am attaching screenshots of it.
The first four terms of each solution are
[tex]1-\dfrac23x^3+\dfrac5{36}x^6-\dfrac{10}{567}x^9[/tex]
and
[tex]x-\dfrac1{24}x^4+\dfrac1{315}x^7-\dfrac7{32,400}x^{10}[/tex]
The arithmetic mean of any two nonnegative real numbers a and b is greater than or equal to their geometric mean vab. [Hint: consider (Va - vb) 0.]
Answer with explanation:
Here, a and b are two real numbers.
Arithmetic Mean of a and b
[tex]A=\frac{a+b}{2}[/tex]
[tex]\rightarrow a< \frac{a+b}{2}<b[/tex]
Geometric Mean of a and b
[tex]G=\sqrt{ab}[/tex]
[tex]\rightarrow a< \sqrt{ab}<b[/tex]
[tex]A-G\\\\=\frac{a+b}{2}-\sqrt{ab}\\\\=\frac{a+b-2\sqrt{ab}}{2}\\\\=[\frac{\sqrt{a}-\sqrt{b}}{\sqrt{2}}]^2>0\\\\A-G>0\\\\A>G[/tex]
Square of difference of any two numbers is greater than or equal to 0.
⇒A.M of two Numbers > G.M of two Numbers
6.Sarah is planning to fence in her backyard garden. One side of the garden is 34 feet long, another side is 30 feet long, and the third side is 67 feet long.If the fencing material costs $3.00 per foot, how much will Sarah’s fence cost?
A.$154.00
B.$938.00
C.$750.00
D.$393.00
Answer:
D. $393.00
Step-by-step explanation:
We have to sum the three distances to get the perimeter.
P= 34 ft + 67 ft+ 30 ft
P = 131 ft
And each foot of material cost $3.00
we get the cost with the distance and de cost of the material:
Cost = 131 ft * 3.00 $ per ft = $393.00
Sarah needs $393.00 to fence her backyard garden
Forty ounces of Lazy Lawn fertilizer covers 1,250 square feet of lawn.
(a) How many ounces would be required to cover a 6,000 square foot lawn?
(b) If Lazy Lawn costs $1.17 for a 24 ounce bag, what is the total cost (in dollars) to fertilize the lawn?
$
To cover a 6,000 square foot lawn, 192 ounces of fertilizer will be required. With the given cost of the fertilizer, the total cost to fertilize the lawn would be $9.36.
Explanation:(a) To calculate how many ounces are required to cover a 6,000 square foot lawn, we can set up a proportion.
40 ounces of Lazy Lawn fertilizer covers 1,250 square feet, so let's represent it as 40/1250. We know that we have a 6,000 square foot lawn but we don't know how many ounces it requires, let's represent it as x/6000.
Our proportion will then be as follows: 40/1250 = x/6000. Cross multiply to find 'x', we will get x = [(40*6000)/1250] = 192 ounces.
(b) Now, to calculate the total cost we first need to know how many 24 ounce bags we will need. 192 ounces divided by 24 ounces per bag gives us 8 bags. Then we calculate the cost, 8 bags times $1.17 per bag gives us a total of $9.36.
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A meteorologist is studying the speed at which thunderstorms travel. A sample of 10 storms are observed. The mean of the sample was 12.2 MPH and the standard deviation of the sample was 2.4. What is the 95% confidence interval for the true mean speed of thunderstorms?
Answer:
The 95% confidence interval for the true mean speed of thunderstorms is [10.712, 13.688].
Step-by-step explanation:
Given information:
Sample size = 10
Sample mean = 12.2 mph
Standard deviation = 2.4
Confidence interval = 95%
At confidence interval 95% then z-score is 1.96.
The 95% confidence interval for the true mean speed of thunderstorms is
[tex]CI=\overline{x}\pm z*\frac{s}{\sqrt{n}}[/tex]
Where, [tex]\overline{x}[/tex] is sample mean, z* is z score at 95% confidence interval, s is standard deviation of sample and n is sample size.
[tex]CI=12.2\pm 1.96\frac{2.4}{\sqrt{10}}[/tex]
[tex]CI=12.2\pm 1.487535[/tex]
[tex]CI=12.2\pm 1.488[/tex]
[tex]CI=[12.2-1.488, 12.2+1.488][/tex]
[tex]CI=[10.712, 13.688][/tex]
Therefore the 95% confidence interval for the true mean speed of thunderstorms is [10.712, 13.688].
A bag of 29 tulip bulbs contains 10 red tulip bulbs, 10 yellow tulip bulbs, and 9 purple tulip bulbs. (a) What is the probability that two randomly selected tulip bulbs are both red? (b) What is the probability that the first bulb selected is red and the second yellow? (c) What is the probability that the first bulb selected is yellow and the second red? (d) What is the probability that one bulb is red and the other yellow?
Answer:
a.The probability that two randomly selected tulip bulbs both are red=[tex]\frac{45}{406}[/tex].
b.The probability that the first bulb selected is red and second yellow=[tex]\frac{50}{406}[/tex].
c.The probability that the first bulb selected is yellow and the second red=[tex]\frac{50}{406}[/tex].
d.The probability that one bulb is red and other yellow=[tex]\frac{50}{203}[/tex].
Step-by-step explanation:
Given
Total number of bulbs= 29
Number of bulbs of red=10
Number of yellow bulbs=10
Number of purple bulbs=9
Formula of probability, P(E)=[tex]\frac{favourable \; cases}{total\;number\; of \; cases}[/tex]
a.The probability that two randomly selected tulip bulbs are both red=[tex]\frac{10}{29}\times\frac{9}{28}=\frac{45}{406}[/tex].
b.The probability of getting first bulb is red=[tex]\frac{10}{29}[/tex].
The probability of getting second bulb is yellow=[tex]\frac{10}{28}[/tex]
Hence,the probability that the firs bulb selected is red and the second bulb yellow=[tex]\frac{10}{29}\times\frac{9}{28}=\frac{45}{406}[/tex]
c. The probability of getting firs bulb is yellow =[tex]\frac{10}{29}[/tex]
The probability of getting second bulb is red=[tex]\frac{10}{28}[/tex]
Hence,the probability that the firs bulb selected is yellow and the second bulb red=[tex]\frac{10}{29}\times\frac{10}{28}=\frac{50}{406}[/tex].
d.The probability of getting first bulb is red and second is yellow=[tex]\frac{50}{406}[/tex]
The probability of getting first bulb is yellow and second is red=[tex]\frac{50}{406}[/tex]
The probability that one bulbe is red and other is yellow= probability of getting first bulb is red and other yellow+ probability of getting first bulb is yellow and other is red
Hence, the probability of getting one bulb is red and other is yellow=[tex]\frac{50}{406}+\frac{50}{406}=\frac{50}{203}[/tex]
49. Prejudice operates mainly through the use of stereotyping. A stereotype is/are______________.
a) a reward system for the dominant group in order to continue the social stratification of minority groups
b) relatively enduring social arrangements that distribute and exercise power.
c) an ethnic or racial slur intended to display the “less than” characteristics of a minority group.
d) the disenfranchisement of individuals or groups based on the media construed images of members of those groups.
e) oversimplified ideas about a group or a social category; generalization or assumptions about the characteristics of a group or an individual
Answer:
d) the disenfranchisement of individuals or groups based on the media construed images of members of those groups.
Step-by-step explanation:
Prejudice operates mainly through the use of stereotyping. A stereotype is/are the disenfranchisement of individuals or groups based on the media construed images of members of those groups.
Six years ago my son was one-third my age at that time.
Six years from now he will be one-half my age at that time.
How old is my son?
m - my age
s - son's age
[tex]s-6=\dfrac{m-6}{3}\\s+6=\dfrac{m+6}{2}\\\\3s-18=m-6\\2s+12=m+6\\\\m=3s-12\\m=2s+6\\\\3s-12=2s+6\\s=18[/tex]
He's 18
Police response time to an emergency call is the difference between the time the call is first received by the dispatcher and the time a patrol car radios that it has arrived at the scene. Over a long period of time, it has been determined that the police response time has a normal distribution with a mean of 8.1 minutes and a standard deviation of 1.9 minutes. For a randomly received emergency call, find the following probabilities. (Round your answers to four decimal places.)(a) the response time is between 5 and 10 minutes(b) the response time is less than 5 minutes(c) the response time is more than 10 minutes
Answer:
a) 0.7898
b) 0.0516
c) 0.1587
Step-by-step explanation:
Given : Mean : [tex]\mu=8.1\text{ minutes}[/tex]
Standard deviation : [tex]\sigma =1.9\text{ minutes}[/tex]
Since , the police response time has a normal distribution.
The formula to calculate the z-score :-
[tex]z=\dfrac{x-\mu}{\sigma}[/tex]
For x=5 minutes.
[tex]z=\dfrac{5-8.1}{1.9}=-1.63[/tex]
For x=10 minutes.
[tex]z=\dfrac{10-8.1}{1.9}=1[/tex]
a) The p-value =[tex]P(-1.63<z<1)=P(z<1)-P(z<-1.63)[/tex]
[tex]=0.8413447-0.0515507=0.789794\approx0.7898[/tex]
b) The p-value =[tex]P(z<-1.63)=0.0515507\approx0.0516[/tex]
c) The p-value =[tex]P(z>1)=1-P(z<1)[/tex]
[tex]=1-0.8413447=0.1586553\approx0.1587[/tex]
We calculated the probability of different police response times using the z-score method. The probability of a response time between 5 and 10 minutes is 0.7897, the probability for less than 5 minutes is 0.0516, and more than 10 minutes is 0.1587.
Explanation:To answer this question, we need to first standardize the response times using the z-score formula: z = (X - μ) / σ, where X is the value we're interested in, μ is the mean, and σ is the standard deviation.
(a) To find the probability that the response time is between 5 and 10 minutes, we first calculate the z-scores for 5 and 10 minutes:
Z(5) = (5 - 8.1) / 1.9 = -1.632 Z(10) = (10 - 8.1) / 1.9 = 1
Next, we find these values in the z-table which yields: P(Z<1) = 0.8413, P(Z<-1.632) = 0.0516. The probability that the response time is between 5 and 10 minutes is the difference between these values, so P(5 < X < 10) = 0.8413 - 0.0516 = 0.7897.
(b) For the response time less than 5 minutes, we calculate the probability using the z-score for 5 minutes. Z(5) = -1.632, looking in the z-table, we find this value equals to 0.0516. Therefore, the response time is less than 5 minutes is 0.0516.
(c) Lastly, the probability for a response time more than 10 minutes is P(Z > 1) which is equal to 1 - P(Z < 1). From the z-table, we find P(Z<1) = 0.8413. Then, P(Z > 1) = 1 - 0.8413 = 0.1587. So, the probability that the response time is more than 10 minutes is 0.1587.
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8. (8 marks) Prove that for all integers m and n, m + n and m-n are either both even or both odd
Answer with explanation:
Let m and n are integers
To prove that m+n and m-n are either both even or both odd.
1. Let m and n are both even
We know that sum of even number is even and difference of even number is even.
Suppose m=4 and n=2
m+n=4+2=6 =Even number
m-n=4-2=2=Even number
Hence, we can say m+n and m-n are both even .
2. Let m and n are odd numbers .
We know that sum of odd numbers is even and difference of odd numbers is even.
Suppose m=7 and n=5
m+n=7+5=12=Even number
m-n=7-5=2=Even number
Hence, m+n and m-n are both even .
3. Let m is odd and n is even.
We know that sum of an odd number and an even number is odd and difference of an odd and an even number is an odd number.
Suppose m=7 , n=4
m+n=7+4=11=Odd number
m-n=7-4=3=Odd number
Hence, m+n and m-n are both odd numbers.
4.Let m is even number and n is odd number .
Suppose m=6, n=3
m+n=6+3=9=Odd number
m-n=6-3=3=Odd number
Hence, m+n and m-n are both odd numbers.
Therefore, we can say for all inetegers m and n , m+n and m-n are either both even or both odd.Hence proved.
Final answer:
The problem is solved by expressing the conditions under which m and n are both even or odd, and their sum and difference in terms of 2k (for even) and 2k+1 (for odd), demonstrating that m+n and m-n are both even or both odd.
Explanation:
To prove that for all integers m and n, m + n and m - n are either both even or both odd, we start by recalling the definition of even and odd numbers. An even number can be expressed as 2k, where k is an integer, and an odd number can be expressed as 2k + 1, where k is an integer.
If m and n are both even, then m = 2a and n = 2b for some integers a and b. Thus, m + n = 2a + 2b = 2(a + b) and m - n = 2a - 2b = 2(a - b), proving that m + n and m - n are both even.If m and n are both odd, then m = 2a + 1 and n = 2b + 1 for some integers a and b. Consequently, m + n = (2a + 1) + (2b + 1) = 2(a + b + 1) and m - n = (2a + 1) - (2b + 1) = 2(a - b), showing that m + n and m - n are both even.If one is even and the other is odd, for example, m = 2a and n = 2b + 1, then m + n = 2a + (2b + 1) = 2(a + b) + 1 and m - n = 2a - (2b + 1) = 2(a - b) - 1, indicating that m + n and m - n are both odd.This argument shows that m + n and m - n must either be both even or both odd for any integers m and n.
In a certain country, the true probability of a baby being a girl is 0.469. Among the next seven randomly selected births in the country, what is the probability that at least one of them is a boy?
Answer:
The probability is 0.995 ( approx ).
Step-by-step explanation:
Let X represents the event of baby girl,
The probability of a baby being a girl is, p = 0.469,
So, the probability of a baby who is not a girl is, q = 1 - 0.469 = 0.531,
Also, the total number of experiment, n = 7
Thus, by the binomial distribution formula,
[tex]P(x)=^nC_x(p)^x q^{n-x}[/tex]
Where, [tex]^nC_x=\frac{n!}{x!(n-x)!}[/tex]
The probability that all babies are girl or there is no baby boy,
[tex]P(X=7)=^7C_7(0.469)^7(0.531)^{7-7}[/tex]
[tex]=0.00499125661758[/tex]
Hence, the probability that at least one of them is a boy = 1 - P(X=7)
= 1 - 0.00499125661758
= 0.995008743382
≈ 0.995
You are going to buy a new car worth $25,800. The dealer computes your monthly payment to be $509.55 for 60 months of financing. What is the dealer's effective rate of return on this loan transaction? The dealer's effective rate of return is 1 1%. (Round to one decimal place.)
Answer:
6.9%
Step-by-step explanation:
Interest rate is the one variable in an amortization formula that cannot be determined explicitly. An iterative solution is required, which means the computation must be done by a calculator, spreadsheet, or web site.
My TI-84 TVM Solver tells me that for the given loan amount and payment schedule, the APR is about 6.9%.
Consider the random variables X and Y with joint density function ???? f(x,y)= x+y, 0≤x≤1;0≤y≤1 0, elsewhere. (a) Find the marginal distributions of X and Y . (b) Find P(X > 0.25,Y > 0.5).
a. The marginal densities
[tex]f_X(x)=\displaystyle\int_0^1(x+y)\,\mathrm dy=x+\frac12[/tex]
and
[tex]f_Y(y)=\displaystyle\int_0^1(x+y)\,\mathrm dx=y+\frac12[/tex]
b. This can be obtained by integrating the joint density over [0.25, 1] x [0.5, 1]:
[tex]P(X>0.25,Y>0.5)=\displaystyle\int_{1/4}^1\int_{1/2}^1(x+y)\,\mathrm dx\,\mathrm dy=\frac{33}{64}[/tex]
Final answer:
To find the marginal distributions of X and Y, we integrate the joint density function over the range of the other variable. The marginal distribution of X is f(x) = x+1/2, for 0≤x≤1. The marginal distribution of Y is f(y) = y+1/2, for 0≤y≤1.
Explanation:
To find the marginal distributions of X and Y, we need to integrate the joint density function over the range of the other variable. For the marginal distribution of X, we integrate f(x,y) with respect to y from 0 to 1:
(∫⁰₁(x+y) dy) = (x+y/2)∣⁰₁ = x+1/2
So, the marginal distribution of X is given by f(x) = x+1/2, for 0≤x≤1.
Similarly, for the marginal distribution of Y, we integrate f(x,y) with respect to x from 0 to 1:
(∫⁰₁(x+y) dx) = (x2/2+xy)∣⁰₁ = y+1/2
Therefore, the marginal distribution of Y is given by f(y) = y+1/2, for 0≤y≤1.
A plumbing supply company has fixed costs of $9,000 per month and average variable costs of $9.30 per unit manufactured. The company has $90,000 available to cover the monthly costs. How many units can the company manufacture? (Fixed costs are those that occur regardless of the level of production. Variable costs depend on the level of production. Your answer should be in terms of whole units produced.)
Answer:
8710 units
Step-by-step explanation:
Step 1: Write all the data
Fixed cost: $9000
Average variable cost: 9.3 per unit
Total cost: 90,000
Total units: x
Step 2: Find the total variable cost
Average variable cost is per unit so it has to be multiplied by the number of units to find the total variable cost.
Total variable cost = average variable cost per unit x number of units
Total variable cost = 9.3x
Step 3: Make the formula for finding x
Total cost = total fixed cost + total variable cost
90,000 = 9000 + 9.3x
81000 = 9.3x
x = 8709.67
Rounded off to 8710 units
!!
Which of the following is a solution to the second order differential equation LaTeX: y''=-4y y ″ = − 4 y ? To answer this question, attempt to verify each of the following proposed solutions. a. LaTeX: y=\sin2t y = sin 2 t b. LaTeX: y=-\frac{2}{3}t^3 y = − 2 3 t 3 c. LaTeX: y=\cos2t y = cos 2 t d. LaTeX: y=e^{2t} y = e 2 t e. LaTeX: y=\frac{y''}{-4}
Answer:
y = sin(2t)y = cos(2t)Step-by-step explanation:
In the case of each of the answers listed above, the second derivative is equal to -4 times the function, as required by the differential equation.
For y = 2/3t^3, the second derivative is 4t, not -4y.
For y = e^(2t), the second derivative is 4y, not -4y.
__
The graph shows the sum of the second derivative and 4y is zero for the answers indicated above, and not zero for the other two proposed answers.
10. Determine whether or not, vectors ui(1,-2, 0, 3), u2 = (2, 3,0,-1), u3 = (3,9,-4,-2) e R is a linear combination of the (2,-1,2,1) 2
If (2, -1, 2, 1) is a linear combination of the three given vectors, then there should exist [tex]c_1,c_2,c_3[/tex] such that
[tex](2,-1,2,1)=c_1(1,-2,0,3)+c_2(2,3,0,-1)+c_3(3,9,-4,-2)[/tex]
or equivalently, there should exist a solution to the system
[tex]\begin{cases}c_1+2c_2+3c_3=2\\-2c_1+3c_2+9c_3=-1\\-4c_3=2\\3c_1-c_2-2c_3=1\end{cases}[/tex]
Right away we get [tex]c_3=-\dfrac12[/tex], so the system reduces to
[tex]\begin{cases}c_1+2c_2=\dfrac72\\\\-2c_1+3c_2=\dfrac72\\\\3c_1-c_2=0\end{cases}[/tex]
Notice that the first equation is the sum of the latter two. The third equation gives us
[tex]3c_1-c_2=0\implies 3c_1=c_2[/tex]
so that in the second equation,
[tex]-2c_1+3c_2=\dfrac72\implies7c_1=\dfrac72\implies c_1=\dfrac12[/tex]
which in turn gives
[tex]3c_1=c_2\implies c_2=\dfrac32[/tex]
and hence the (2, -1, 2, 1) is a linear combination of the given vectors, with
[tex]\boxed{(2,-1,2,1)=\dfrac12(1,-2,0,3)+\dfrac32(2,3,0,-1)-\dfrac12(3,9,-4,-2)}[/tex]
40% of the groups budget was spent on activities. If $64,000 was spent on the activities, what was the full budget? solve with the aid of a diagram. State what type of problem this is. if it's division, which type? Explain your reasoning, not just by using an equation.
Answer:
The full budget has a total value of $160,000
Step-by-step explanation:
This is a simple ratio problem and can be solved using the Rule of Three property. The Rule of Three is used to compare two ratios and find the missing part. In this case the ratios would be the following.
[tex]\frac{64,000}{40 percent} = \frac{x}{100 percent}[/tex]
[tex]\frac{64,000 * 100 percent}{40 percent} = \frac{x}[/tex]
[tex]\frac{6,400,000}{40 percent} = \frac{x}[/tex]
[tex]160,000= \frac{x}[/tex]
So now we know that 100% (The full budget) has a total value of $160,000.
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.
A rectangle is inscribed with its base on the x-axis and its upper corners on the parabola y = 11 − x 2 . What are the dimensions of such a rectangle with the greatest possible area?
Answer:[tex]\frac{22}{3}[/tex],[tex]2\dot \sqrt{\frac{11}{3}}[/tex]
Step-by-step explanation:
Given
rectangle with its base on x-axis
and other two corners at parabola
and parabola is downward facing symmetric about y-axis
let y be the y co-ordinate of the corner thus x co-ordinate is given by
[tex]x=\pm \sqrt{11-y}[/tex]
Thus lengths of rectangle is [tex]2\sqrt{11-y}[/tex] & y
Area [tex]=y\times 2\sqrt{11-y}[/tex]
differentiating w.r.t to y for maximum area
[tex]\frac{\mathrm{d} A}{\mathrm{d} y}=2\times \sqrt{11-y}-\frac{y}{2\dot \sqrt{11-y}}=0[/tex]
we get y=[tex]\frac{22}{3}[/tex]
and [tex]x=\pm \sqrt{\frac{11}{3}}[/tex]
A_{max}=16.21 units
You borrow $680 from your brother and agree to pay back $750 in 3 months. What simple interest rate will you pay?
Answer:
hence rate interest r = 41.176%
Step-by-step explanation:
The amount borrowed= $680
amount payed back = $750
therefore, interest incurred = 750-680= $70
time, t= 3 months = 3/12= 0.25 years
rate%, r
we know that SI= [tex]\frac{PRT}{100}[/tex]
70= [tex]\frac{680\timesr\0.25}{100}[/tex]
r=[tex]\frac{7000}{0.25\times680} = 41.176[/tex]
hence rate interest r = 41.176%
Samantha is trying to complete the Free Throw wellness challenge. In order to earn her chip, she needs to hit 13 out of 20 free throws on the basketball court Her last three attempts were 12 out of 20, 10 out of 20, and 9 out of 20 How far is her average free throw percentage from the needed free throw percentage to earn the chip? (round to the nearest whole number)
Answer:
21 % below what she needs
Step-by-step explanation:
She had hit 12, 10 and 9
This averages to
(12+10+9)/3 = 31/3 =10 1/3
She needs 13
Percentage = (needed-actual)/needed * 100%
= (13-10 1/3) / 13 * 100%
= (2 2/3) /13 * 100%
=.205128205 * 100%
=20.5128205%
To the nearest whole number
21 %
She is 21 % below what she needs
Samantha's current average free throw percentage is 15 percentage points away from the 65% needed to earn her wellness challenge chip.
Explanation:Samantha is working on improving her free throw percentage in basketball, and she needs to calculate how far her average is from the required target to earn her wellness challenge chip. To determine her average free throw percentage, we first calculate her average number of successful shots by adding her last three attempts and dividing by three: (12 + 10 + 9) / 3 = 31 / 3 = 10.33, rounded to 10 successful shots on average. Since she takes 20 shots each time, her average percentage is (10 / 20) * 100 = 50%.
To earn her chip, she needs to hit 13 out of 20 free throws, which is (13 / 20) * 100 = 65%. The difference between her current average and the needed percentage is 65% - 50% = 15%. Rounding to the nearest whole number, she is 15 percentage points away from the required free throw percentage to succeed in the challenge.
A vehicle factory manufactures cars. The unit cost C (the cost in dollars to make each car) depends on the number of cars made. If x cars are made, then the unit cost is given by the function C(x) = 0.9x^2 -234x + 23,194 . How many cars must be made to minimize the unit cost?
Do not round your answer.
Answer:
130 cars.
Step-by-step explanation:
The cost function is given by:
C(x) = 0.9x^2 -234x + 23,194; where x is the input and C is the total cost of production.
To find the minimum the unit cost, there must be a certain number of cars which have to be produced. To find that, take the first derivative of C(x) with respect to x:
C'(x) = 2(0.9x) - 234 = 1.8x - 234.
To minimize the cost, put C'(x) = 0. Therefore:
1.8x - 234 = 0.
Solving for x gives:
1.8x = 234.
x = 234/1.8.
x = 130 units of cars.
To check whether the number of cars are minimum, the second derivative of C(x) with respect to x:
C''(x) = 1.8. Since 1.8 > 0, this shows that x = 130 is the minimum value.
Therefore, the cars to be made to minimize the unit cost = 130 cars!!!
Use an element argument to prove each statement. Assume that all sets are subsets of a universal set U.
For all sets A, B, andC, if A ⊆ B then A∪C ⊆ B∪C
We are asked to prove the statement,
For all sets A, B, and C, if A ⊆ B then A∪C ⊆ B∪C
Let us consider set A as:
A={1,3,4,5}
and B={1,2,3,4,5,6,7}
Clearly we may observe that A is a subset of B.
( Since, all the elements of set A are contained in set B .
Hence, A is a subset of B)
Now let us consider set C as:
C={1,2}
Hence,
A∪C={1,2,3,4,5}
and
B∪C={1,2,3,4,5,6,7}
Still we observe that:
A∪C ⊆ B∪C
Since all the elements of the set A∪C are contained in the set B∪C.
Explain how simulation is used in the real world. Provide a specific example from your own line of work, or a line of work that you find particularly interesting.
Answer:
Explained
Step-by-step explanation:
Simulation is nothing but an approximate or somewhat accurate imitation of a real world situation. Simulation is actually a computer generated graphics to predict how a system will behave under given set of parameters, without actually applying real resources. Simulation finds a variety of application in various fields. Simulation of blood flowing through veins and arteries. Simulation of LBW decisions in a cricket match, which helps Umpires to make correct LBW decisions in a match. A lot of recondite process can understood using Simulation videos that is why concept of smart learning as been introduced.
Show that the equation is exact and find an implicit solution. y cos(xy) + 3x^2 + [x cos(xy) + 2y]y' = 0
We have
[tex]\dfrac{\partial(y\cos(xy)+3x^2)}{\partial y}=\cos(xy)-xy\sin(xy)[/tex]
[tex]\dfrac{\partial(x\cos(xy)+2y)}{\partial x}=\cos(xy)-xy\sin(xy)[/tex]
so the ODE is indeed exact. Then there's a solution of the form [tex]f(x,y)=C[/tex] such that
[tex]\dfrac{\partial f}{\partial x}=y\cos(xy)+3x^2[/tex]
[tex]\implies f(x,y)=\sin(xy)+x^3+g(y)[/tex]
Differentiating wrt [tex]y[/tex] gives
[tex]\dfrac{\partial f}{\partial y}=x\cos(xy)+2y=x\cos(xy)+g'(y)[/tex]
[tex]\implies g'(y)=2y\implies g(y)=y^2+C[/tex]
Then the solution to the ODE is
[tex]f(x,y)=\boxed{\sin(xy)+x^3+y^2=C}[/tex]