Answer:
21
Step-by-step explanation:
Let n represent the number we're looking for. Then ...
n × (proteus length) = 3 × (palustris length)
n × 0.7 mm = 3 × 4.9 mm
n = (3 × 4.9 mm)/(0.7 mm) = 3 × 49/7 = 3 × 7
n = 21
You would have to line up 21 amoeba proteus to equal the length of three pelomyxa palustris.
Answer:
21
Step-by-step explanation:
1. 49
x 3 1
14.7.
21 _=period move
2. 0.7./14.7.
-14
07
-7
0
check your answer:
21
x0.7. 1
14.7.
A = D Based on the given information, choose the similarity statement that you would use to say ABC~DEF. If you could NOT conclude the triangles similar, then choose NOT. AA SAS SSS NOT
Answer:
SAS (side angle side)
Step-by-step explanation:
We have a pair of corresponding sides and the included angle. The angle is equal, but the sides are a fraction of the other triangle's side and has an equal rate.
2AC=DF
2AB=DE
The triangles are congruent
Answer:
SAS
Step-by-step explanation:
The temperature dropped from 75 degrees to 50 degrees. What was the percent decrease in the temperature? 33% 50% 66%
Answer: 33%
Step-by-step explanation:
Given : The temperature dropped from 75 degrees to 50 degrees.
Decrease in temperature ( in degrees) = 75-50=25
The formula to find the percent decrease :-
[tex]\dfrac{\text{Decrease in temperature}}{\text{Initial temperature}}\times100\\\\=\dfrac{25}{75}\times100\\\\=33.3333333333\approx33\%\ \ \text{[Rounded to the nearest whole percent.]}[/tex]
Hence, the percent decrease in the temperature = 33%
The Island of Knights and Knaves has two types of inhabitants: Knights, who always tell the truth, and Knaves, who always lie. As you are exploring the Island of Knights and Knaves you encounter two people named A and B. A tells you "I am a Knave, but B isn’t". B says nothing. Determine the nature of A and B, if you can.
Answer: First, suppose that A is a knight. then when he says "i am a knave" he would be lying, so you have a logical failure because knights can't lie.
if A is a knave and says "I am a Knave, but B isn’t" then he would be telling a truth in the first part.
now you have two paths to tink itm as A said a truth, he can't be a knave. but if you consider the whole sentence can be splitted in two sentences.
I am a Knave ----- wealready know that will be a truth.
but B isn’t----- and now, as the first sentence is true, this must be false, so the sum of both sentences is false.
so A is a knave and B is a knave.
Final answer:
After analyzing the statements provided by A and the silence of B, the logical deduction reveals that both A and B are Knights, given the inherent contradictions in A's statement if he or B were Knaves.
Explanation:
The Island of Knights and Knaves presents a classic example of logical deduction. Given that A states he is a Knave but also says 'B isn’t a Knave', we can infer A's nature through contradiction. If A were a Knave, he would not tell the truth about himself or B, creating a paradox since a Knave can't tell the truth. If A is a Knight, his statement is also impossible since Knights cannot lie. Therefore, A must be a Knight, making the first part of his statement a lie (which is not possible for a Knight), but the second part true: B is not a Knave. Consequently, for the statement to uphold the rules of the island, B must be a Knight as well, which is consistent with the silent B offering no statements that could be lies.
Find the average rate of change.
p(x) = 6x + 7 on [2, 2 + h] , h ≠ 0
The average rate of change of a function is found with the formula (f(b) - f(a)) / (b - a). When applying this formula to the function p(x) = 6x + 7 over the interval [2, 2 + h], we find that the average rate of change is 6.
Explanation:In Mathematics, the average rate of change of a function on the interval [a, b] is given by the formula (f(b) - f(a)) / (b - a). In this case, our function is p(x) = 6x + 7, and the interval is [2, 2 + h]. So, we can plug these values into the formula to get an expression for the average rate of change.
First, calculate p(2 + h) and p(2). Here they are:
p(2 + h) = 6 × (2 + h) + 7 = 12 + 6h + 7 = 19 + 6hp(2) = 6 × 2 + 7 = 12 + 7 = 19Substitute these expressions into the average rate of change formula:
(P(2 + h) - P(2)) / (2 + h - 2) = (19 + 6h - 19) / (h) = 6h / h = 6.
So, the average rate of change of the function p(x) = 6x + 7 on the interval [2, 2 + h] is 6.
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Susan needs to buy apples and oranges to make fruit salad. She needs 15 fruits in all. Apples cost $3 per piece, and oranges cost $2 per piece. Let m represent the number of apples. Identify an expression that represents the amount Susan spent on the fruits. Then identify the amount she spent if she bought 6 apples.
Answer:
Step-by-step explanation:
$3x6=18 the six represents the apples and the 3 is the cost of each apple, 18 is the cost.
$2x9=$18 the nine is the oranges and the two is the money spent on each one. The total would be $36 in total for all the fruit.
So (9x2)+(3x6)=$36
Answer with Step-by-step explanation:
Susan needs to buy apples and oranges to make fruit salad.
She needs 15 fruits in all.
Let m represent the number of apples.
Number of oranges= 15-m
Apples cost $3 per piece, and oranges cost $2 per piece.
Amount spent= $ (3m+2(15-m))
= $ (3m + 2×15 - 2m)
= $ (m+30)
If she bought 6 apples.
i.e. m=6
Amount spent =$ (6+30)
= $ 36
Hence,
Expression that represents the amount Susan spent on the fruits is:
m+30
The amount Susan spent if she bought 6 apples is:
$ 36
The data from an independent-measures research study produce a sample mean difference of 4 points and a pooled variance of 18. If there are n = 4 scores in each sample, what is the estimated standard error for the sample mean difference?
Answer: 3
Step-by-step explanation:
Given : Pooled variance : [tex]\sigma^2=18[/tex]
Sample sizes of each sample = [tex]n_1=n_2=4[/tex]
We know that the standard error for the sample mean difference is given by :-
[tex]S.E.=\sqrt{\sigma^2(\dfrac{1}{n_1}+\dfrac{1}{n_2})}\\\\=\sqrt{(18)(\dfrac{1}{4}+\dfrac{1}{4})}\\\\=\sqrt{(18)(\dfrac{1}{2})}=\sqrt{9}=3[/tex]
Hence, the estimated standard error for the sample mean difference =3
Simon is factoring the polynomial. x2−4x−12 (x−6)(x+______) What value should Simon write on the line? −6 −2 2 6
Answer:
2
Step-by-step explanation:
You have to find a number that added with -6 equals -4, and multiplied equals -12.
Just have to do the opperations and that is all!
[tex](x-6)(x+2)=x^2+2x-6x-12=x^2-4x-12[/tex]
Hope you like it!
Answer:
Option C is the answer.
Step-by-step explanation:
Simon is factorizing the polynomial x² - 4x - 12 = (x - 6)( x + ......)
We will factorize the left hand side of the given expression
x² - 4x - 12
= x² - 6x + 2x - 12
Now we will break 12 into the factors so that sum of the factors should equal to 4
{ 6 × 2 = 12 and 6 - 2 = 4]
= x(x - 6) + 2(x - 6)
= (x + 2)(x - 6)
Therefore, the blank space should be replaced by 2.
Option C is the answer.
Lake Alice is full of alligators and turtles the number of turtles is 16 less than 3 times the number of alligators in the lake there are 200 reptiles total
Answer:
72 alligators, 128 turtles
Step-by-step explanation:
When you put the words into the form of an equation, with a being alligators, you get
3a-16=200
So you have to do 'letters left numbers right'. This gives you
3a=216
Now you have to divide. 216 divided by 3 equals 72. So there are 72 alligators. 200 minus 72 equals 128, so there are 128 turtles
Answer:
The number of alligators and number of turtles are 54 and 146 respectively.
Step-by-step explanation:
Given :
The number of turtles is 16 less than 3 times the number of alligators in the lake
There are 200 reptiles total.
To Find : Find the numbers of alligators and turtles .
Solution:
Let the number of alligators be x
So, The number of turtles is 16 less than 3 times the number of alligators
Number of turtles = 3x-16
Now we are given that there are 200 reptiles in total .
[tex]x+3x-16=200[/tex]
[tex]4x-16=200[/tex]
[tex]4x=216[/tex]
[tex]x=54[/tex]
Number of alligators = 54
Number of turtles = 3(54)-16 = 146
Hence the number of alligators and number of turtles are 54 and 146 respectively .
A repeated-measures experiment and a matched-subjects experiment each produce a t statistic with df = 10. How many individuals participated in each study?
Answer: 11
Step-by-step explanation:
We know that the degree of freedom for a t-distribution is given by :-
[tex]df=n-1[/tex], where n is the sample size.
Given : A repeated-measures experiment and a matched-subjects experiment each produce a t statistic with df = 10.
Then, the number of individuals participated in each study = [tex]df+1=10+1=11[/tex]
Hence, the number of individuals participated in each study =11.
In the equation left parenthesis x squared plus 14 x right parenthesis plus left parenthesis y squared minus 18 y right parenthesisequals5, complete the square on x by adding _______ to both sides. Complete the square on y by adding _______ to both sides.
Answer:
Complete the square on x by adding 49 to both sides.
Complete the square on y by adding 81 to both sides.
Step-by-step explanation:
We have been given an equation [tex](x^2+14x)+(y^2+18y)=5[/tex]. We are asked to complete the squares for both x and y.
We know to complete a square, we add the half the square of coefficient of x or y term.
Upon looking at our given equation, we can see that coefficient of x is 14 and coefficient of y is 18.
[tex](\frac{14}{2})^2=7^2=49[/tex]
[tex](\frac{18}{2})^2=9^2=81[/tex]
Now, we will add 49 to complete the x term square and 81 to complete y term square on both sides of our given equation as:
[tex](x^2+14x+49)+(y^2+18y+81)=5+49+81[/tex]
Applying the perfect square formula [tex]a^2+2ab+b^2=(a+b)^2[/tex], we will get:
[tex](x+7)^2+(y+9)^2=135[/tex]
Therefore, We can complete the square on x by adding 49 to both sides and the square on y by adding 81 to both sides.
Given: △ABC, m∠C=90° m∠ABC=30°, AL ∠ bisector LB=18m. Find: CL
SOMEONE PLZ ANSWER FAST IM BEGGING UUUUU
Answer:
9 m
Step-by-step explanation:
∠CAB = 90° -∠ABC = 90° -30° = 60°
Since AL bisects angle A, we have ...
∠LAC = ∠LAB = 60°/2 = 30°
Then ∠BAL = ∠ABL = 30° and ΔABL is isosceles with AL = LB = 18 m.
The 30°-60°-90° triangle ALC has sides in the ratio ...
CL : CA : AL = 1 : √3 : 2
so
CL/AL = 1/2
CL = AL/2 = (18 m)/2 = 9 m
_____
It can help to draw a diagram
In triangle BCL, since it is a 30-60-90 triangle, the side opposite the 60-degree angle is √3 times the side opposite the 30-degree angle. Thus, the length of side CL is 18√3 meters.
In triangle ABC, you're told that angle C is 90 degrees and the angle ABC is 30 degrees. Therefore angle ACB (or BAC) is 60 degrees because the sum of all angles in a triangle is 180 degrees.
You're also given that LB, a line that bisects angle B, is 18 meters. The triangle BCL is a 30-60-90 triangle, a special type of triangle where the sides are in the ratio 1:√3:2.
In this case, LC (the side opposite the 60-degree angle) is √3 times the side opposite the 30-degree angle (LB), which is 18 meters. So, the length of CL = 18√3 meters.
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Given m< LOM = 3x +38 m< MON= 9x+28 find m< LOM:
PLEASE HELP ME !!!
Answer:
The answer to your question is: m∠LOM = 44°
Step-by-step explanation:
Data
m< LOM = 3x +38
m< MON= 9x+28
m< LOM = ?
Process
They are complementary angles
m∠LOM + m∠MON = 90°
3x + 38 + 9x + 28 = 90°
12x + 66 = 90°
12x = 90 - 66
12x = 24
x = 24/12
x = 2
m∠LOM = 3(2) + 38
= 6 + 38
= 44°
m∠ MON = 9(2) + 28
m∠MON = 18 + 28
m∠MON = 46°
You are going to make three shelves for your father and have one piece of lumber 14 feet long. Your plan is to make the top shelf a foot shorter than then middle shelf and to have the bottom shelf a foot shorter then twice the length of the top shelf. How long is each shelf?
Answer:
The lengths of the shelves are 3.5 feet , 4.5 feet , 6 feet
Step-by-step explanation:
* Lets explain how to solve the problem
- There are 3 shelves
- You have one piece of lumber 14 feet long
- Your plane is:
# The top shelf is 1 foot shorter than the middle shelf
# The Bottom shelf a foot shorter than twice the length of the top shelf
* Assume that the length of the middle shelf is x feet
∵ The length of the middle shelf = x
∵ The top shelf is shorter by 1 foot
∴ The length of the top shelf = x - 1
∵ The length of the bottom shelf is 1 less than twice the length of
the top shelf
- That means multiply the length of the top shelf by 2 and subtract
1 from the product
∵ The length of the top shelf is x - 1
∴ The length of the bottom shelf = 2(x - 1) - 1
- Simplify it by multiplying the bracket by 2 and add like terms
∴ The length of the bottom shelf = 2x - 2 - 1
∴ The length of the bottom shelf = 2x - 3
* The sum of the lengths of the 3 shelves equal the length of lumber
∵ The length of the lumber is 14 feet
∵ The length of the 3 shelves are x - 1 , x , 2x - 3
∴ x - 1 + x + 2x - 3 = 14
- Add like terms in the left hand sides
∴ 4x - 4 = 14
- Add 4 for both sides
∴ 4x = 18
- Divide both by 4
∴ x = 4.5
- Lets find the length of each shelf
∵ The length of the top shelf is x - 1
∴ The length of the top shelf = 4.5 - 1 = 3.5 feet
∵ The length of the middle shelf is x
∴ The length of the middle shelf = 4.5 feet
∵ The length of the bottom shelf is 2x - 3
∴ The length of the bottom shelf = 2(4.5) - 3 = 9 - 3 = 6 feet
* The lengths of the shelves are 3.5 feet , 4.5 feet , 6 feet
Final answer:
To find the length of each shelf, a system of equations is created based on the conditions given. Solving this system shows the middle shelf to be 4.5 feet, the top shelf to be 3.5 feet, and the bottom shelf to be 6 feet long.
Explanation:
The question involves using a piece of lumber that is 14 feet long to make three shelves with specific relative lengths. We can let the length of the middle shelf be x feet. Therefore, the top shelf will be x - 1 feet long, and the bottom shelf will be 2(x - 1) - 1 feet long, which simplifies to 2x - 3 feet. Adding together the lengths of the three shelves gives us the total length of the lumber:
x (middle shelf)x - 1 (top shelf)2x - 3 (bottom shelf)So: x + (x - 1) + (2x - 3) = 14.
Solving the equation:
x + x - 1 + 2x - 3 = 144x - 4 = 144x = 18x = 4.5Therefore, the middle shelf is 4.5 feet long, the top shelf is 3.5 feet (4.5 - 1), and the bottom shelf is 6 feet (2(3.5) - 1).
Enrollment in a school has grown exponentially since the school opened. A graph depicting this growth is shown. Determine the percentage rate of growth.
To find the percentage rate of growth, calculate the percentage change in enrollment from one year to the next using the graph. Perform these calculations for each pair of consecutive years to determine the overall percentage rate of growth.
Explanation:To determine the percentage rate of growth, we need to analyze the graph showing the enrollment growth of the school. Exponential growth is represented by a curve that increases more and more steeply over time. To find the rate of growth, we can calculate the percentage change in enrollment from one year to the next.
For example, if the enrollment was 100 in Year 1 and 200 in Year 2, the percentage change would be (200-100)/100 * 100 = 100%. This means the enrollment doubled from Year 1 to Year 2.
By performing similar calculations for each pair of consecutive years, we can find the percentage rate of growth over the entire period represented by the graph.
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The percentage rate of growth for the school's enrollment is approximately 24% per year.
Explaination:To determine the percentage rate of growth, we need to find the common ratio and the common difference in the exponential function that represents the school's enrollment. From the given graph, we can see that the enrollment doubles approximately every three years. This means that the common ratio is 2. The initial enrollment is 500, which is represented by the value "a" in the exponential function. The final enrollment, which is approximately 4000, is represented by "an". Using these values, we can write the exponential function as follows:
[tex]an = a * 2^(n-1)[/tex]
Substituting the initial enrollment and final enrollment in this equation, we get:
[tex]4000 = 500 * 2^(n-1)[/tex]
Dividing both sides by 500 and simplifying, we get:
[tex]8 = 2^(n-1)[/tex]
Taking the logarithm of both sides with base 2, we get:
(n-1) = log2(8)
(n-1) = 3
Adding 1 to both sides, we get:
n = 4
This means that it takes approximately four years for the school's enrollment to double. To find the percentage rate of growth per year, we need to find the common difference in the exponential function. The common difference is calculated as follows:
Common difference =[tex]ln(y2 / y1) / (x2 - x1)[/tex]
Here, x1 and x2 are two consecutive years, and y1 and y2 are their corresponding enrollments. Using this formula, we can calculate the common difference as follows:
Common difference = ln(4000 / 3200) / (7 - 4) = 0.263975 (approximately 24%) per year. This means that every year, the school's enrollment grows by approximately 24%.
Suppose f left parenthesis x right parenthesis right arrow 150f(x)→150 and g left parenthesis x right parenthesis right arrow 0g(x)→0 with g(x)less than<0 as x right arrow 3x→3. Determine modifyingbelow lim with x right arrow 3 startfraction f left parenthesis x right parenthesis over g left parenthesis x right parenthesis endfractionlimx→3 f(x) g(x).
Final answer:
The limit of f(x)/g(x) as x approaches 3 is negative infinity, since f(x) approaches 150 and g(x) approaches 0 with g(x) < 0.
Explanation:
We are given that as x approaches 3, f(x) approaches 150, and g(x) approaches 0 while being less than zero. The question is to determine the limit of f(x)/g(x) as x approaches 3.
To find this limit, we should consider the behavior of both f(x) and g(x) as x approaches 3.
Since f(x) approaches a finite number and g(x) approaches 0, the limit of the quotient could potentially be infinity or negative infinity, depending on the sign of g(x).
Since g(x) is less than 0 as x approaches 3, the quotient f(x)/g(x) will approach negative infinity.
Hence, the limit limx→3 f(x)/g(x) = -∞.
The tallest living man at one time had a height of 230 cm. The shortest living man at that time had a height of 91.3 cm. Heights of men at that time had a mean of 170.53 cm and a standard deviation of 5.91 cm. Which of these two men had the height that was more extreme?
Answer: The shortest living man at that time had the height that was more extreme.
Step-by-step explanation:
We will z scores to solve this exercise. The formula we need is:
[tex]z=\frac{x-\mu}{\sigma}[/tex]
Where [tex]x[/tex] is the raw score, [tex]\mu[/tex] is the mean and [tex]\sigma[/tex] is the standard deviation.
We know at that time heights of men had a mean of 170.53 centimeters and a standard deviation of 5.91 centimeters, then:
[tex]\u=170.53\\\\\sigma=5.91[/tex]
Knowing that the tallest living man at that time had a height of 230 centimeters, we get:
[tex]z=\frac{230-170.53}{5.91}\approx10.07[/tex]
And knowing that the shortest living man at that time had a height of 91.3 centimeters, we get:
[tex]z=\frac{91.3-170.53}{5.91}\approx-13.40[/tex]
Based on this, we can conclude that the shortest living man at that time had the height that was more extreme.
Evaluate the function g(x) = –2x2 + 3x – 5 for the input values –2, 0, and 3. G(–2) = –2(–2)2 + 3(–2) – 5 g(–2) = –2(4) – 6 – 5 g(–2) = g(0) = g(3) =
Answer:
Step-by-step explanation:
g(x)= -2 x^2 + 3 x - 5
g(-2) = -2 . (-2)^2 + 3. (-2) - 5 = -2 . 4 - 6 - 5 = - 8 - 6 - 5 = - 19
g(0) = -2 . (0)^2 + 3 . 0 - 5 = -2 . 0 + 0 - 5 = 0 + 0 - 5 = - 5
g(3) = -2 . (3)^2 + 3 . (3) - 5 = -2 . 9 + 9 - 5 = -18 + 9 - 5 = - 14
The value of g(x) is the input values are –2, 0, and 3 are -19, -5 and -14
Functions and valuesGiven the following function
g(x) = –2x² + 3x – 5
For the input value of -2
g(-2) = –2(-2)² + 3(-2) – 5
g(-2) = -8 - 6 - 5
g(-2) =-19
If the value of x is 0
g(0) = –2(0)² + 3(0)– 5
g(0) = -5
If the vaue of x is 3
g(3) = –2x² + 3x – 5
g(3) = -2(3)² + 3(3)– 5
g(3) =-18 + 9 - 5
g(3) = -14
Hence the value of g(x) is the input values are –2, 0, and 3 are -19, -5 and -14
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A solid lies between planes perpendicular to the x-axis at x=0 and x=3. The cross-sections perpendicular to the axis on the interval 0≤x≤3 are squares whose diagonals run from the parabola y=−x‾‾√ to the parabola y=x‾‾√.Find the volume of the solid.
Answer:
V = 9
Step-by-step explanation:
You can see it in the picture.
The side length of the square is found using the diagonal, which is the distance between the two parabolas. The area of each square cross section is then integrated from 0 to 3 to find the solid's volume, which is 9 cubic units.
Explanation:For these types of volume problems, you'll need to integrate. However, first you have to find the area of the square formed by the diagonals. The distance between the parabolas y=-√x and y=√x forms the square's diagonal. This distance, or length of the diagonal, can be obtained by adding the y-values of the two parabolas which gives 2√x. Given the diagonal, the side length of the square (s) can be obtained from the diagonal using Pythagoras theorem: s=diagonal/√2 => s=2√x/√2 => s=√2* √x => s=√2x. The area of the square is the side length squared, A=s² => A= 2x. Now, integrate the area function from 0 to 3 to get the volume of the solid: Volume= ∫ from 0 to 3 [2x dx] = [x²] from 0 to 3 = 9 - 0 = 9 cubic units.
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In 1995, the standard bus fare in Chicago was $1.50. In 2008, the standard bus fare was $2.25. Give your answer as a percentage value. Find the percent increase of the bus fare in Chicago.
Answer:
The bus fair is 50% increases.
Step-by-step explanation:
The percentage is the proportion of the relation to the whole.
Percentage increase is calculate as ratio of difference of original and new value to the original value. i.e.
[tex]\frac{ Percentage\ increase\ \ =\ \ new\ value - original \ value}{original\ \ value}[/tex]
∴ [tex]\frac{ Percentage\ increase\ \ =\ \ 2.25 - 1.50 }{1.50}[/tex]
⇒ Percentage increase = 50%
By using percentage, the result obtained is-
Percentage increase in bus fare in Chicago = 50%
What is percentage?
Suppose there is a number and the number has to be expressed as a fraction of 100. The fraction is called percentage.
For example 2% means [tex]\frac{2}{100}[/tex]. Here 2 is expressed as a fraction of 100.
Here,
Bus fare in the year 1995 in Chicago= $1.50
Bus fare in the year 2008 in Chicago = $2.25
Increase in bus fare = $(2.25 - 1.50) = $0.75
Percentage increase in bus fare in Chicago = [tex]\frac{0.75}{1.50}\times 100[/tex]
= 50%
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2(x + 1 ) - 3(x + 5) ≥ 0
answer is x is less than or equal to -13
hope this helps:-)
Answer:
x ≤ -13.
Step-by-step explanation:
2(x + 1 ) - 3(x + 5) ≥ 0 Distribute the 2 and -3 over the parentheses:
2x + 2 - 3x - 15 ≥ 0
-x ≥ 15 - 2
-x ≥ 13
x ≤ -13 Note: when dividing by a negative the inequality sign is flipped .
Please help with the first question....
Answer:
A) The functions are not inverses of each other.
Step-by-step explanation:
[tex]f(g(x))=\sqrt{(x^2+3)-3}=\sqrt{x^2}=|x|\ne x[/tex]
The result of f(g(x)) is not always x, so the functions are not inverses of each other.
In general, a quadratic (or any even-degree polynomial) such as g(x) cannot have an inverse function because it does not pass the horizontal line test.
What is the equation of the axis of symmetry?
Answer:
x = 2
Step-by-step explanation:
Since the parabola is opening vertically up then the equation of symmetry is vertical and of the form x = c
The axis of symmetry passes through the vertex (2, 0), thus
equation of axis of symmetry is x = 2
The length of a rectangle is five times its width.
If the area of the rectangle is 405 in^2, find its perimeter.
Answer:
The answer to your question is: Perimeter = 108 in
Step-by-step explanation:
Data
Length (l) = 5 width (w)
A = 405 in²
Perimeter = ?
Formula
Area = l x w
Perimeter = 2w + 2l
Process
405 = 5w x w
405 = 5w²
405/5 = w²
w = √81
w = 9 in
l = 5(9) = 45 in
Perimeter = 2(9) + 2(45)
= 18 + 90
= 108 in
3. Suppose that you initially have $100 to spend on books or movie tickets. The books start off costing $25 each and the movie tickets start off costing $10 each. For each of the following situations, would the attainable set of combinations that you can afford increase or decrease?
a. Your budget increases from $100 to $150 while the prices stay the same.
b. Your budget remains $100, the price of books remains $25, but the price of movie tickets rises to $20.
c. Your budget remains $100, the price of movie tickets remains $10, but the price of a book falls to $15.
Answer:
Suppose that you initially have $100 to spend on books or movie tickets.
The books start off costing $25 each and the movie tickets start off costing $10 each.
a. Your budget increases from $100 to $150 while the prices stay the same.
Increase
b. Your budget remains $100, the price of books remains $25, but the price of movie tickets rises to $20.
Decrease
c. Your budget remains $100, the price of movie tickets remains $10, but the price of a book falls to $15.
Increase
Please help with this!
Answer:
y = 8RS = 51ST = 29Step-by-step explanation:
(a) You use the fact that the lengths RS and ST total the length RT.
RS +ST = RT
(6y+3) +(3y+5) = 80 . . . . . substitute the given values
9y +8 = 80 . . . . . . . . . . . . .simplify
9y = 72 . . . . . . . . . . . . . . . .subtract 8
72/9 = y = 8 . . . . . . . . . . . .divide by the coefficient of y
___
(b) Now, the value of y can be substituted into the expressions for RS and ST to find their lengths.
RS = 6y +3 = 6·8 +3
RS = 51
ST = 3y +5 = 3·8 +5
ST = 29
___
Check
RS +ST = 51 +29 = 80 = RT . . . . the numbers check OK
Please please help me out! :)
Answer:
x = 24
Step-by-step explanation:
Given that y varies directly with x the the equation relating them is
y = kx ← k is the constant of variation
To find k use the condition y = 10 when x = 8, then
k = [tex]\frac{y}{x}[/tex] = [tex]\frac{10}{8}[/tex] = 1.25, thus
y = 1.25x ← equation of variation
When y = 30, then
30 = 1.25x ( divide both sides by 1.25 )
x = 24
An octave contains twelve distinct notes (on a piano, five black keys and seven white keys). How many different eight-note melodies within a single octave can be written if the black keys and white keys need to alternate?
To determine the number of different eight-note melodies that alternate between black and white keys within a single octave, you calculate the permutations starting with either type of key and add them together, resulting in 141,120 possible melodies.
Explanation:The question asks: How many different eight-note melodies within a single octave can be written if the black keys and white keys need to alternate? To solve this, we need to understand the structure of a piano octave, which consists of seven white keys and five black keys. Since melodies must alternate between black and white keys, starting with a white key will always result in a pattern of white-black-white-black, and so on, until eight notes are reached. Conversely, starting with a black key follows a black-white pattern.
If we start with a white key, we have 7 options for the first note. The next note (a black key) gives us 5 options. This alternating pattern continues, decreasing the number of options by 1 for each type of key used, until we have selected all eight notes. Mathematically, this calculates as 7 × 5 × 6 × 4 × 5 × 3 × 4 × 2. Similarly, starting with a black key would result in a calculation of 5 × 7 × 4 × 6 × 3 × 5 × 2 × 4.
However, since an eight-note melody can start with either a white or a black key, we calculate both scenarios and add them together for the total amount of possible melodies. The sum of the series for both starting options gives us 141,120 possible eight-note melodies that alternate between black and white keys within a single octave.
Which of the following is the solution to 9 | x + 4 | >= 54?
PLEASE HELP
Answer:
your selection is correct
Step-by-step explanation:
You can divide by 9 to get ...
| x+4 | ≥ 6
This resolves to two inequalities:
-6 ≥ x +4 ⇒ -10 ≥ xx +4 ≥ 6 ⇒ x ≥ 2These are disjoint intervals, so the solution set is the union of them:
x ≤ -10 or 2 ≤ x
Answer:
Step-by-step explanation: A is correct
If ΔEFG ~ ΔLMN with a ratio of 2:1, which of the following is true?
segment EF over segment LM equals segment FG over segment MN
segment EF is congruent to segment LM
segment EF over segment LM equals segment EG over segment LM
segment EG is congruent to segment LM
Answer:
segment EF over segment LM equals segment FG over segment MN
Step-by-step explanation:
The triangles are similar, not congruent, so any answer choice with the word "congruent" can be ignored.
The sequence of letters in the triangle name tells you the corresponding segments:
EF corresponds to LMEG corresponds to LNFG corresponds to MNCorresponding segments have the same ratio, so ...
EF/LM = FG/MN . . . . . . matches the first answer choice
EF/LM = EG/LN . . . . does not match the 3rd answer choice
Answer:
segment EF over segment LM equals segment FG over segment MN
PLEASE HELP!!!
Solve the system of equations using the substitution method.
x=3+1/2y
−2x−y=3
Enter your answer, as decimals, in the boxes.
( , )
Answer:
x = 3+1/2 y -----Equation-1
-2x-y = 2 -------Equation-1
Multiplying equation 1 by 2 we get
2x = 2*(3+1/2y)
2x = 6+y
y = 2x-6
substituting the value of of y in equation2
-2x - (2x-6) = 2
-2x -2x +6 = 2
-4x = 2-6
-4x = -4
x = -4/-4 = 1
y = 2x-6 = 2-6 = -4
x = 1
y = -4
Step-by-step explanation:
Answer:
x=0.75 and Y=-4.5
Step-by-step explanation:
let x=3+1/2y.....(1)
-2x-y=3.......(2)
substitute (1) into (2)
-2(3+1/2y)-y=3
-6-y-y=3
-2y=9
y=-9/2
put y=-9/2 into (1)
x=3+(1/2)(-9/2)
x=-4.5