1) Which linear equation BEST represents the line of best fit for the scatterplot? A) y = x B) y = 3x C) y = -3x D) y = 5x + 1 2) Which graph shows no correlation? A) A B) B C) C D) D * Hover over answer image to enlarge 3) Which of the choices is the best example of a line of best fit for the scatterplot? A) A B) B C) C D) D * Hover over answer image to enlarge 4) The graph represents the current stock market trends. The best fit line shows A) no correlation B) weak positive correlation C) weak negative correlation D) strong positive correlation 5) Describe the correlation. A) no correlation B) prime correlation C) positive correlation D) negative correlation A survey was taken asking participants their age and how many soft drinks they drink a week. The results are displayed in the scatterplot. The data for people age 15-19 are not shown. Based on the scatterplot, how many soft drinks would 15-19 year olds be expected to drink in a week? A) 4 B) 6 C) 8 D) 14 7) Person BMI Total Cholesterol 1 20 157.87 2 22 170.85 3 24 183.83 4 26 196.81 5 28 209.79 6 30 222.77 7 32 235.75 Total Cholesterol and BMI were measured several individuals. Using the regression line, what is the expected total cholesterol if a person has a BMI of 35? A) 249.45 B) 253.21 C) 255.22 D) 257.43 8) The Dudley family just brought home twins from the hospital. Their neighbor's baby was born on the same day as the twins. A reasonable conclusion is that the Dudley family will spend more money on diapers. Is this association positive, negative, or neither? Is the relationship more likely a causation or correlation? A) neither B) positive; causation C) negative; correlation D) positive; correlation 9) Which causal relationship is justifiable? A) Children with bigger feet spell better. Spelling better causes a child's feet to grow. B) Surf board sales rise when lemonade sales rise. Drinking lemonade causes more people to buy surfing boards. C) The traffic is heavier around the stadium when a game is being played. Games being played cause more traffic. D) An elementary school child has more cavities than his baby brother. He also has a larger vocabulary. An increased vocabulary causes cavities. 10) Based on this graph, which statement MUST be true? A) More x causes less y. B) More x causes more y. C) There is a negative correlation between x and y. D) There is a positive correlation between x and y.
The questions pertain to the analysis of linear relationships between variables using scatter plots, lines of best fit through linear regression, and understanding correlation coefficients to identify the strength and direction of relationships in data.
Explanation:The questions provided are centered around the concepts of linear equations, scatter plots, correlation, and regression analysis in the realm of mathematics. Scatter plots are graphical representations showing the relationship between two variables. In these types of questions, the independent variable is plotted on the x-axis, and the dependent variable is plotted on the y-axis. To analyze the relationship, one can use linear regression to find the line of best fit, which is a straight line that best represents the data on a scatter plot. The correlation coefficient, often denoted as r, indicates the strength and direction of the linear relationship between two variables.
The line of best fit can be found by calculating the least-squares line, which minimizes the sum of the squares of the vertical distances of the points from the line. The equation of this line is typically in the form y = a + bx, where 'a' is the y-intercept and 'b' is the slope. The slope indicates how much the dependent variable changes for a one-unit change in the independent variable. The y-intercept is the value of the dependent variable when the independent variable is zero. A correlation coefficient of zero implies no linear relationship between the variables.
When looking at data such as stock market trends or health-related measurements like BMI and cholesterol, understanding the strength and type of correlation is essential for making predictions. For example, a positive correlation indicates that as one variable increases, the other variable tends to increase, while a negative correlation indicates the opposite. It's important to note that correlation does not imply causation; just because two variables are correlated does not mean that one causes the other.
9. find the value of x ?
Answer:
B is the answer at least i think also are you in gaca? if so webmail me my name is Angela Petersen
Hiroto’s texting plan costs $20 per month, plus $0.05 per text message that is sent or received. Emilia’s plan costs $10 per month and $0.25 per text. Using the graph below, which statement is true?
Hiroto’s plan costs more than Emilia’s plan when more than 50 texts are sent.
Both plans cost the same when 22 texts are sent.
Emilia’s plan costs more than Hiroto’s plan when more than 22 texts are sent.
Both plans cost the same when 50 texts are sent.
Answer:
it's D
Step-by-step explanation:
y= .05x+20
x=50
y=.05(50)+20
2.5+20
y=22.5
y=.25x+10
x=50
y=.25(50)+10
12.5+10
y=22.5
I NEED HELP ASAP
APEX!!!
The series will be:
[tex]4+16+64+.......+2^{50}[/tex]
Hence, Option A is the right answer
Step-by-step explanation:
The series can be fount out by putting the values of i in the expression written with the summation
The expression is:
[tex]2^{2i}[/tex]
while i = 1 to 25
Putting i = 1
[tex]2^{2(1)}\\= 2^2\\= 4[/tex]
Putting i = 2
[tex]2^{2(2)}\\= 2^4\\= 16[/tex]
Putting i = 3
[tex]2^{2(3)}\\= 2^6\\= 64[/tex]
....
Putting i = 25
[tex]2^{2(25)}\\= 2^{50}[/tex]
The series will be:
[tex]4+16+64+.......+2^{50}[/tex]
Hence, Option A is the right answer
Keywords: Summation, Series
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Find a numerical value of one trigonometric function of x for cos^2x+ 2sin x-2=0
Answer:
x = 90°
Step-by-step explanation:
We are given a trigonometric function of x from which we have to a solution for x.
The function is [tex]\cos^{2} x + 2\sin x - 2 = 0[/tex]
⇒ [tex]1 - \sin^{2} x + 2\sin x - 2 = 0[/tex]
{Since we know the identity [tex]\sin^{2} \alpha + \cos^{2} \alpha = 1[/tex]}
⇒ [tex]\sin^{2} x - 2 \sin x + 1 = 0[/tex]
⇒ [tex](\sin x - 1)^{2} = 0[/tex]
{Since we know the formula (a - b)² = a² - 2ab + b²}
⇒ [tex](\sin x - 1) = 0[/tex]
⇒ [tex]\sin x = 1 = \sin 90[/tex]
⇒ x = 90° (Answer)
To solve cos^2 x + 2sin x - 2 = 0, we convert cos^2 x to 1 - sin^2 x and solve the quadratic equation sin^2 x - 2sin x + 1 = 0, finding that sin x equals 1. Thus, the numerical value of the trigonometric function is sin x = 1.
To find a numerical value of one trigonometric function of x for the equation cos2x + 2sin x - 2 = 0, let's start by expressing everything in terms of sin x:
Using the Pythagorean identity, we know that cos2x = 1 - sin2x. So, we can write:
(1 - sin2x) + 2sin x - 2 = 0
Simplifying, we get:
1 - sin2x + 2sin x - 2 = 0
-sin2x + 2sin x - 1 = 0
This is a quadratic equation in terms of sin x. Let's solve it:
sin2x - 2sin x + 1 = 0
We recognize this as a perfect square trinomial:
(sin x - 1)2 = 0
So, we have:
sin x - 1 = 0
Therefore:
sin x = 1
So, the numerical value of one trigonometric function of x from the given equation is sin x = 1.
25(M-2)=650 what is M ?
Answer:M=24
Step-by-step explanation:
There are 2 ways to do this
---------------------------------------------------
Method 1) Divide both sides by 25, then add 2 to both sides
25(M-2) = 650
M-2 = 650/25
M-2 = 26
M = 26+2
M = 28
---------------------------------------------------
Method 2) Distribute the 25 through to each term inside the parenthesis. Then isolate for M by adding 50 to both sides, and then dividing both sides by 2.
25(M-2) = 650
25M - 50 = 650
25M = 650+50
25M = 700
M = 700/25
M = 28
---------------------------------------------------
Either way the answer is 28
#1
Suppose g(a) = 7.6 cos(0.5a).
a. What is the argument of the cosine function? (Enter an expression.)
Answer:
[tex]0.5a[/tex]
Step-by-step explanation:
We have been given a trigonometric function [tex]g(a)=7.6\text{ cos}(0.5a)[/tex]. We are asked to find the argument of the cosine function.
We know that a trigonometric equation is solved for an unknown angle and that unknown angle is known as the argument of the trigonometric function. For example: [tex]\text{cos}(\theta)=0[/tex]. In this equation [tex]\theta[/tex] is the argument of the equation.
Upon looking at our given function, we can see that [tex]0.5a[/tex] is the argument.
If x=2, what is (.8x + .1.2) equals
Answer:
2.8
Step-by-step explanation:
.8*2=1.6 1.2
1.6+1.2=2.8
Answer:
2.8
Step-by-step explanation:
Simply Substitute for X:
[tex]0.8(2) + 1.2\\1.6+1.2\\2.8[/tex]
You would get 2.8 as the answer.
Train A and Train B leave the station at 2 P.M. The graph below shows the distance covered by the two trains. Compare the speeds of the two trains.
Answer:
Train b is moving faster than a by 45 units an hour
Step-by-step explanation:
A bag has 30 tiles. Numbered 1-30. Perfect squares to non-perfect squares . Write ratio in simplest form .
Answer:
Ratio = [tex]\frac{Perfect.squares}{non.Perfect.squares}[/tex] = [tex]\frac{1}{5}[/tex]
Step-by-step explanation:
The perfect squares from 1-30 are:
1, 4, 9, 16, 25
Total no. of perfect squares = five =5
Total no. of non perfect squares = 30-5 = 25
Ratio =[tex]\frac{Perfect.squares}{non.Perfect.squares}[/tex] = 5 / 25 = [tex]\frac{1}{5}[/tex]
The ratio of perfect squares to non-perfect squares for the numbers 1 to 30 is 1:5.
Explanation:A perfect square is a number that is the square of an integer. For the numbers 1 to 30, the perfect squares are 1, 4, 9, 16, 25, as these numbers are squares of integers 1, 2, 3, 4, 5 respectively. The number of perfect squares is 5.
The total number of tiles is 30. So the number of non-perfect squares is 30 - 5 = 25.
The ratio of perfect squares to non-perfect squares in simplest form, then, is 5 : 25. Simplified, this ratio is 1 : 5.
Learn more about Perfect Squares,#SPJ6
Suppose the graph of y=f(x) includes the points (1,5), (2,3), and (3,1).
Based only on this information, there are two points that must be on the graph of y=f(f(x)). If we call those points (a,b) and (c,d), what is ab+cd?
Answer: 17
================================
How I got that answer:
(2,3) and (3,1) have '3' in common in that the y value of the first pairs with the x value of the second.
If you picture a chain, then you start with x = 2, move to y = 3, then move to x = 3 and then y = 1
2 ---> 3 ---> 3 ---> 1
So f(f(2)) = f(3) = 1
If g(x) = f(f(x)), then we know (2,1) is on the graph of g(x)
-------------------------
Repeat for (3,1) and (1,5)
3 ---> 1 ---> 1 ---> 5
f(3) = 1
g(x) = f(f(x)) = f(f(3)) = f(1) = 5
We know that (3,5) is on the graph of g(x)
-------------------------
The two points on g(x) are: (2,1) and (3,5)
Comparing that to (a,b) and (c,d) we can see
a = 2, b = 1, c = 3, d = 5
a*b + c*d = 2*1 + 3*5 = 2 + 15 = 17
2 Construct a rational function that will help solve the problem. Then, use a calculator to answer the question.
An open box with a square base is to have a volume of 500 cubic inches. Find the dimensions of the box that will have
minimum surface area. Let x = length of the side of the base.
Show your work:
Answer:
Dimension of box:-
Side of square base = 10 in
Height of box = 5 in
Minimum Surface area, S = 300 in²
Step-by-step explanation:
An open box with a square base is to have a volume of 500 cubic inches.
Let side of the base be x and height of the box is y
Volume of box = area of base × height
[tex]500=x^2y[/tex]
Therefore, [tex]y=\dfrac{500}{x^2}[/tex]
It is open box. The surface area of box, S .
[tex]S=x^2+4xy[/tex]
Put [tex]y=\dfrac{500}{x^2}[/tex]
[tex]S(x)=x^2+\dfrac{2000}{x}[/tex]
This would be rational function of surface area.
For maximum/minimum to differentiate S(x)
[tex]S'(x)=2x-\dfrac{2000}{x^2}[/tex]
For critical point, S'(x)=0
[tex]2x-\dfrac{2000}{x^2}=0[/tex]
[tex]x^3=1000[/tex]
[tex]x=10[/tex]
Put x = 10 into [tex]y=\dfrac{500}{x^2}[/tex]
y = 5
Double derivative of S(x)
[tex]S''(x)=2+\dfrac{4000}{x^3}[/tex] at x = 10
[tex]S''(10) > 0[/tex]
Therefore, Surface is minimum at x = 10 inches
Minimum Surface area, S = 300 in²
A movie theater has n rows and m seats in each row. If each ticket costs $5.60, how much do all tickets to one movie cost?
Total cost of tickets for one movie showing is calculated by multiplying the total number of seats (n rows times m seats per row) by the cost per ticket, which is $5.60.
Explanation:To calculate the total cost of all tickets for one movie showing in a theater with n rows and m seats per row, you'll need to use multiplication to find the total number of seats and then multiply it by the cost per ticket. Here is a step-by-step guide:
Multiply the number of rows (n) by the number of seats per row (m) to find the total number of seats. This is n × m.Multiply the total number of seats by the cost per ticket, which is $5.60, to find the total cost for all tickets. This is (n × m) × $5.60.The final calculation will give you the total cost of tickets for one movie showing.For example, if a theater has 10 rows with 20 seats in each row, the total number of seats is 10 × 20 = 200. The total cost for all tickets would then be 200 × $5.60 = $1120.
what is a equivalent fraction of 10/25, 6/8, 3/5, 1/10
Answer:
Step-by-step explanation:
10/25=20/50=40/100
6/8=3/4=12/16
3/5=6/10=60/100
1/10=10/100
Evaluate x-2 for x=8
Answer:
6
Step-by-step explanation:
8-2=6
9-4 (3+6*2)=__+1=
(need answer asap please)
A theater is selling tickets for a performance. Mr. Smith purchased 8 senior tickets and 5 child tickets for $136 for his friends and family. Mr. Jackson purchased 4 senior tickets and 6 child tickets for $96. What is the price of a senior ticket?
Answer:
The price of a senior ticket is $12.
Step-by-step explanation:
Given:
Mr. Smith purchased 8 senior tickets and 5 child tickets for $136. Mr. Jackson purchased 4 senior tickets and 6 child tickets for $96.
Now, to get what is the price of a senior ticket.
Let the senior ticket be [tex]x[/tex] and the child ticket be [tex]y[/tex]:
So, according to question
[tex]8x+5y=136[/tex].........(1)
[tex]4x+6y=96[/tex]...........(2)
Now, we have system of equations:
Multiplying the equation (2) by -2 we get:
[tex]-8x-12y=-192[/tex].......(3)
Now, adding the equation (3) and (1) the variables and the numbers:
[tex]-8x-12y+8x+5y=-192+136[/tex]
[tex]-7y=-56[/tex]
Dividing both sides by -7 we get:
[tex]y=8[/tex]
Putting the value of y in equation (2) we get:
[tex]4x+6(8)=96[/tex]
[tex]4x+48=96[/tex]
On solving the equation we get:
[tex]x=12[/tex].
Therefore, the price of a senior ticket is $12.
Marquise is 9 years old. In two years, Marquise will be 1/3 of his mother’s age. What is his mother’s age?
Answer:
33
Step-by-step explanation:
9+2=1/3x
11=1/3x
x=11/(1/3)=(11/1)(3/1)=33/1=33
Vivian has $57,366.66 in a savings account. The interest rate is 9 2/5%, compounded annually.
To the nearest cent, how much interest will she earn in 4 years
Answer:20652.00
Step-by-step explanation:
The formula would be p*r*t
p is the principal which is amount of money before interest
r is the interest rate
t is time period
so it would be 57,366.66*9 2/5%*4
9 2/5 as a decimal would be 9.4 or 0.09
57,366.66*9.4=539246.604*4=2156986.416
The correct amount would be $20652.00 in 4 years
Use 0.09 when u multiply instead of 9.4 because it is much easier
Which exponential function has an initial value of 2? f(x) = 2(3x) On a coordinate plane, an exponential function approaches y = 0 in quadrant 2 and increases into quadrant 1. It crosses the y-axis at (0, 0.5) and goes through (2, 2). f(x) = 3(2x) A 2-column table has 5 rows. The first column is labeled x with entries negative 2, negative 1, 0, 1, 2. The second column is labeled f (x) with entries one-eighth, one-fourth, one-half, 1, 2.
Answer:
The correct answer is A. f(x)= 2(3^x)
Step-by-step explanation:
The exponential function y = 2(3)ˣ, has an initial value of 2
Exponential functionAn exponential function is in the form:
y = abˣ
where y, x are variables, a is the initial value of y and b is the multiplicative rate of change
Given the exponential function y = 2(3)ˣ, has an initial value of 2
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Please simplify the expression.
[tex]x^{7}[/tex] · [tex]y^{3}[/tex] · [tex]x^{8}[/tex] · [tex]y^{2}[/tex]
A. [tex]x^{15}[/tex] · [tex]y^{6}[/tex]
B. [tex]x^{15}[/tex] · [tex]y^{5}[/tex]
C. [tex]x^{56}[/tex] · [tex]y^{6}[/tex]
D. [tex]x^{56}[/tex] · [tex]y^{5}[/tex]
1/8% is what as a decimal
Answer:
[tex]\large\boxed{\dfrac{1}{8}\%=\dfrac{1}{800}}[/tex]
Step-by-step explanation:
[tex]p\%=\dfrac{p}{100}\\\\\dfrac{1}{8}\%=\dfrac{\frac{1}{8}}{100}=\dfrac{1}{8}\cdot\dfrac{1}{100}=\dfrac{1}{800}\\\\\text{other method}\\\\\text{Convert the fraction to the decimal:}\\\\\dfrac{1}{8}=0.125\to\dfrac{1}{8}\%=0.125\%\\\\0.125\%=\dfrac{0.125}{100}=\dfrac{0.125\cdot1000}{100\cdot1000}=\dfrac{125}{100000}=\dfrac{125:125}{100000:125}=\dfrac{1}{800}[/tex]
- Suppose y varies directly as x. If y = -7 when x = -14, find x when y = 10.
Answer:
[tex]x=20[/tex]
Step-by-step explanation:
we know that
A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form [tex]y/x=k[/tex] or [tex]y=kx[/tex]
in this problem
For x=-14, y=-7
Find the value of the constant of proportionality k
[tex]k=y/x[/tex]
substitute
[tex]k=-7/-14=0.5[/tex]
so
The linear equation is
[tex]y=0.5x[/tex]
Find x when the value of y=10
substitute the value of y in the equation
[tex]10=0.5x[/tex]
solve for x
Multiply by 2 both sides
[tex]x=20[/tex]
Final answer:
In direct variation relationship 'y = kx', using the given y = -7 when x = -14, the constant of variation 'k' is found to be 0.5. To find x when y = 10, we use 'y = kx' to get x = 20.
Explanation:
The student's question revolves around the concept of a direct variation, which is a fundamental topic in algebra. The direct variation relationship between two variables 'x' and 'y' can be expressed as 'y = kx', where 'k' is the constant of variation. To determine the constant 'k', we can use the given condition, which states that when x = -14, y = -7. This equation simplifies to 'k = y/x', so 'k = (-7)/(-14)' which equals 0.5.
Now, we need to find 'x' when y is 10. Using the direct variation equation 'y = kx' and our calculated 'k' value of 0.5, we can set up the equation '10 = 0.5x'. Solving for 'x', we get 'x = 10/0.5' which simplifies to 'x = 20'. Thus, when y equals 10, the corresponding value of x is 20.
what is the slope of the line that contains the points (-2,5) and 6,-3)
Answer:
slope = - 1
Step-by-step explanation:
Calculate the slope m using the slope formula
m = (y₂ - y₁ ) / (x₂ - x₁ )
with (x₁, y₁ ) = (- 2, 5) and (x₂, y₂ ) = (6, - 3)
m = [tex]\frac{-3-5}{6+2}[/tex] = [tex]\frac{-8}{8}[/tex] = - 1
5 ft
3 ft
3 ft
2 ft
2 ft
2 ft
3 ft
4 ft
find the area
Answer:
multiply all together
Step-by-step explanation
an = 5 × an-1 and a1 = 3.
What is a5
Enter your answer in the box.
A5 =
Answer:
[tex]A_{5} = 1875[/tex]
Step-by-step explanation:
The geometric sequence is represented by
[tex]A_{n} = 5 \times A_{n - 1}[/tex] .......... (1) and [tex]A_{1} = 3[/tex]
So, [tex]A_{2} = 5 \times A_{2 - 1} = 5 \times A_{1} = 5 \times 3 = 15[/tex]
{Putting n = 2}
Again, putting n = 3 in equation (1), we get
[tex]A_{3} = 5 \times A_{2} = 5 \times 15 = 75[/tex]
Again, putting n = 4 in equation (1), we get
[tex]A_{4} = 5 \times A_{3} = 5 \times 75 = 375[/tex]
Again, putting n = 5 in equation (1), we get
[tex]A_{5} = 5 \times A_{4} = 5 \times 375 = 1875[/tex] (Answer)
If 4 quarts of paint are needed for a 75-foot fence, how many quarts are needed for an
825-foot fence?
Answer:
44 quarts of paint
Step-by-step explanation:
Given,
75-foot fence needs = 4 quarts.
We have to use the unitary method to determine how many quarts will be needed for the fencing system. Hence,
75-foot fence needs = 4 quarts of paint
1-feet fence needs = (4/75) quarts of paint
825-foot fence needs = (4 x 825)/75 quarts of paint
= 3,300/75 quarts of paint
= 44 quarts of paint
Therefore, we need 44 quarts of paint for 825-foot fence.
To determine how many quarts of paint are needed for an 825-foot fence, we can set up a proportion and solve for the unknown quantity.
Explanation:To determine how many quarts of paint are needed for an 825-foot fence, we can use the concept of ratios. Since we know that 4 quarts of paint are needed for a 75-foot fence, we can set up a proportion:
4 quarts of paint / 75 feet = ? quarts of paint / 825 feetTo solve for the unknown quantity, we can cross-multiply and solve for the missing value:
4 quarts of paint * 825 feet = ? quarts of paint * 75 feetDividing both sides of the equation by 75, we get:
? quarts of paint = (4 quarts of paint * 825 feet) / 75 feetBy performing the calculation, we find that quarts of paint is approximately 44 quarts. Therefore, 44 quarts of paint are needed for an 825-foot fence.
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find the slope of (5,-2)and(5,8)
Answer:
The answer is undetermined
Step-by-step explanation:
i'm not joking the when the line is parallel to the y axis it has no slope because it runs vertically but if the line was horizontal the slope would be 0
list from smallest to largest 7/12 1/2 2/3 4/10 1/6
Answer:
So if you're having difficulty visualizing the differences, you can rewrite them so they all have the same denominator
7/12 = 35/60
1/2 = 30/60
2/3 = 40/60
4/10 = 24/60
1/6 = 10/60
So now it's easier to see how they compare to each other.
10/60, 24/60, 30/60, 35/60, 40/60
And then simplify them or just refer to what they were before
1/6, 4/10, 1/2, 7/12, 2/3
I hope this helps!
Ginger adds 15 mL of vitamin C drops to her guinea pig's water everyday. A bottle
of vitamin C drops holds 350mL and costs $4.85. About how much does she spend
on vitamin C drops each year?
A- $70 to $90
B- $50 to $70
C- more than $90
D- less than $50
it is d
Step-by-step explanation:
Answer:
A
Step-by-step explanation:
First find how many bottles Ginger will need.
15 mL x 365 day = 5475 mL for 1 yr
5475 mL / 350mL = 16 bottles
Then find the price for the 16 bottles.
16 bottles x $4.85 = $77.60