Which situation is an example of an observational study?

a.) Having a randomly selected group of students take a pen and paper test and comparing the results with another randomly selected group of students who took the same test on the computer?

b.) Polling voters about their favorite candidates in upcoming elections.

c.) Recording the reaction time of participants in a study who were asked to press a button as soon as they see a certain picture on a screen.

d.) Asking kids in a kindergarten classroom about the average number of pieces of fruit they eat each day.

Answers

Answer 1

Answer:

Step-by-step explanation:

C! hopes this helps


Related Questions

Translate the following sentence into an equation. The sum of twice a number x and 13 is two less than three times x.

Question 20 options:

a)

2x + 13 = 3x – 2


b)

2(x + 13) + 3x – 2


c)

2x + 13 = 2 – 3x


d)

2x + 13 = 3(x – 2)

Answers

Answer:

2x + 13 = 3x - 2

Step-by-step explanation:

This should be the answer

Answer:

its 2

Step-by-step explanation:

Which is the value of this expression when a = 5 and k = negative 2? (3^2 a^-3)(3 a^-4)^-2

Answers

Answer: C 25/9

Step-by-step explanation:

If the triangle on the grid below is translated by using the rule (x, y) right-arrow (x minus 2, y + 2), what will be the coordinates of A prime?

Answers

Answer:

A' (-4,0)

Step-by-step explanation:

The complete question is

If the triangle on the grid below is translated by using the rule (x, y) right-arrow (x minus 2, y + 2), what will be the coordinates of A prime? On a coordinate plane, triangle A B C has points A(negative 2, negative 2), B(negative 2, negative 4), C(2, negative 4)

we know that

The rule of the translation is

(x,y) -----> (x-2,y+2)

The coordinates of point A (-2,-2)

Applying the rule of the translation to coordinate A

A (-2,-2) ----- A' (-2-2,-2+2)

A (-2,-2) ----- A' (-4,0)

Answer:

The answer is A on edge

Step-by-step explanation:

4 times a number divided by 3 is 5 more than that number divided by 2 what is the value of that number

Answers

Answer:

x=6

Step-by-step explanation:

Let the number be x

Then 4 times a number divided by 3 is 5 more than that number divided by 2 gives the equation:

[tex] \frac{4x}{3} = \frac{x}{2} + 5[/tex]

Multiply through by the LCD, which is 6.

[tex] 6 \times \frac{4x}{3} = 6 \times \frac{x}{2} + 5 \times 6[/tex]

Cancel out to obtain:

[tex] 2 \times 4x =3 \times x + 30[/tex]

[tex]8x = 3x + 30[/tex]

Group similar terms

[tex]8x - 3x = 30[/tex]

Simplify the LHS

[tex]5x = 30[/tex]

Divide both sides by 5 to get:

[tex]x = 6[/tex]

Write the Equation of the line in slope intercept form
(0, -3), (7.5,0)

Answers

Answer:

Step-by-step explanation:

First, start off by solving for the slope using this formula:

[tex]\frac{y_{2} -y_{1} }{x_{2}-x_{1} }[/tex]

Then, plug in the values: [tex]\frac{0-(-3)}{7.5-0}[/tex]

Solve the equation: [tex]\frac{3}{7.5}[/tex]

That's your slope.

Then plug in one of the coordinates given in the problem for x and y and solve this equation:

y=[tex]\frac{3}{7.5}[/tex]x+b

Hope that helped!!! :)

What is the slope of the line containing the points (3,4) and (-6,10)

Answers

Answer:-.6666666667x +6

Step-by-step explanation:

I have a school calculator

Answer:

-2/3 is the slope

Step-by-step explanation:

Slope = y2 - y1/x2 - x1

= 10 - 4/-6 - 3

= 6/-9

=-2/3

can you graph 6=6? infinite solutions

Answers

Answer:6 = 6 represents a true statement because 6 is always equal to 6. When graphed on a coordinate plane, this equation would result in a straight line at y = 6, which means that every point on the line corresponds to a solution of the equation. Since the line extends infinitely in both directions, there are infinitely many solutions to this equation.

Step-by-step explanation:

Carter plays 5/8 of a basket ball game. The basket ball game is 40 minutes long. Which if the following shows how to find the number of minutes carter plays?

Answers

Answer:

25 minutes is how long Carter played

Step-by-step explanation:

Final answer:

To find out how many minutes Carter plays, multiply 40 minutes by 5/8, which results in 25 minutes of playtime.

Explanation:Finding the Number of Minutes Carter Plays

To determine the number of minutes Carter plays in a basketball game, which is 40 minutes long, when he plays 5/8 of the game, we use multiplication. We multiply the total game time by the fraction of the game played:

40 minutes (total game length) × (5/8) (fraction of the game played)

Steps to calculate:

Multiply the numerator of the fraction (5) by the total game time (40 minutes). 5 × 40 = 200.Divide the product by the denominator of the fraction (8). 200 ÷ 8 = 25 minutes.

Therefore, Carter plays for 25 minutes of the basketball game.

use the fact that 2 1/2 divided by 1/8 equals 20 to find 2 1/2 divided by 5/8.

Answers

Answer:

The value of the expression is 4.

Step-by-step explanation:

Consider the provided information.

We have given that:

[tex]\dfrac{2\dfrac{1}{2} }{\dfrac{1}{8} } =20[/tex]

Now we need to find the value of:

[tex]\dfrac{2\dfrac{1}{2} }{\dfrac{5}{8} } =?[/tex]

Consider the provided fact:

[tex]\dfrac{2\dfrac{1}{2} }{\dfrac{1}{8} } =20[/tex]

Multiply [tex]\frac{1}{5}[/tex] both sides.

[tex]\dfrac{1}{5}\times \dfrac{2\dfrac{1}{2} }{\dfrac{1}{8} } =20\times\dfrac{1}{5}[/tex]

[tex]\dfrac{1\times2\dfrac{1}{2} }{5\times\dfrac{1}{8} } =20\times\dfrac{1}{5}[/tex]

[tex]\dfrac{2\dfrac{1}{2} }{\dfrac{5}{8} } =4[/tex]

Hence, the value of the expression is 4.

Kevin has an after-school delivering advertising after 9 weeks he had earned a mean of $24 per week how much does he need to earn in the 10th week to increase his mean weekly earnings to $25​

Answers

Answer:

$34

Step-by-step explanation:

So he earns $24 per week (ima just say p/w to make it shorter) meaning he earned around $216 in total. To get to $25 p/w, you have to get $250 in total from the 10 weeks. So $250 - $216 = $34.

⭐ Answered by Foxzy0⭐

⭐ Brainliest would be appreciated, I'm trying to reach genius! ⭐

⭐ If you have questions, leave a comment, I'm happy to help! ⭐

2. Graph each equation using a table of values.
(a)) y = 3x - 1

Answers

Make an x and y table, and pick any values to plug in for x in the equation.

I will use the numbers from -2 to 2

Now plug in the values you picked for x into the equation to find its y-value

x = -2

y = 3x - 1   Plug in -2 for x

y = 3(-2) - 1

y = -6 - 1

y = -7

x = -1

y = 3x - 1

y = 3(-1) - 1

y = -3 - 1

y = -4                

Do the same for the rest of the numbers, and graph each point and draw a line connecting them.

Identify the x intercept and y intercept of the line 2x-4y=-12

Answers

-12/2 = -6 = x
-12/-4 = 3 = y

The x intercept is -6 and the y intercept is 3

The x-Intercepts of the line 2x - 4y = -12 is -6 and the y-intercept is 3.

To identify the x and y intercepts of the line, we set one variable to zero and solve the equation for the other variable.

For the x-intercept, we set y=0 and solve for x in the equation: 2x - 4(0) = -12, hence x = -6.

For the y-intercept, set x=0 and solve for y in the equation: 2(0) - 4y = -12, hence y = 3.

Therefore, the x-intercept is -6 and the y-intercept is 3

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Use the drawing tools to form the correct answers on the graph. Plot the zeros of this function: f(x) = (x – 1)(x – 7).

Answers

The answer is in the graph picture

The zeros of the function f(x) = (x - 1)(x - 7) are 1 and 7

The function is given as:

f(x) = (x - 1)(x - 7)

Set the function to 0.

So, we have:

f(x) = (x - 1)(x - 7) = 0

This gives

(x - 1)(x - 7) = 0

Split

(x - 1) = 0 or (x - 7) = 0

Remove brackets

x - 1 = 0 or x - 7 = 0

Solve for x

x = 1 or x = 7

Hence, the zeros of the function are 1 and 7

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If you need 100 trucks for every 1500 yards, how many will you need for 1000 yards ?

Answers

The answer would be 66.666 repeating or rounding it up to 70

Help please I really need it

Answers

Answer:

X-Intercept is -45. (Answer would be (-45,0))

Step-by-step explanation:

You can use Desmos which is a graphing calculator to figure out the answer. Plug the equation into Desmos and it will show you a line and where the x-intercept is. And boom, you got your answer.

Financing a balloon payment under a new fixed rate loan is called a

A reset option

O

B. loan adjustment

O

c. balloon refinance

D. exercise option

Answers

Answer:

rest set option

Step-by-step explanation:

The graph of which function has a minimum located at (4, –3)?

f(x) = one-halfx2 + 4x – 11
f(x) = –2x2 + 16x – 35
f(x) = one-halfx2 – 4x + 5
f(x) = 2x2 – 16x + 35

Answers

Answer:

f(x) = 1/2x^2 – 4x + 5  (the third option)

Step-by-step explanation:

I looked it up on a graphing calculator.

The quadratic function that has a minimum located at (4, -3) is:

[tex]f(x) = (1/2)*x^2 - 4x + 5[/tex]

Which function has a minimum located at (4, -3)?

All the options are quadratic functions, so we need to find the one with a leading coefficient positive, which also has a vertex at (4, -3).

The 3 ones with positive leading coefficients are:

[tex]f(x) = (1/2)*x^2 + 4x -11[/tex]

[tex]f(x) = (1/2)*x^2 - 4x + 5[/tex]

[tex]f(x) = 2x^2 - 16x + 35[/tex]

The vertex of the first one is at:

[tex]x = -4/(2*1/2) = -4[/tex]

The x-value of the vertex must be x = 4, so we can discard this.

For the second quadratic function the x-value of the vertex is:

[tex]x = -(-4)/(2*1/2) = 4[/tex]

Then the y-value of the vertex is:

[tex]f(4) = (1/2)*4^2 - 4*4 + 5 = -3[/tex]

Then the vertex is at (4, -3), so this is the correct option.

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What is the prime factorization of 40?
2 times 5
2 times 20
2 times 2 times 2 times 5
2 times 2 times 4 times 5

Answers

Answer:

C.

Step-by-step explanation:

2 times 2 times 2 times 5 = 40

The prime factorization of 40 is 2 times 2 times 2 times 5, which can be written as 2^3 * 5. So, option C, "2 times 2 times 2 times 5," is the correct prime factorization of 40.

The prime factorization of the number 40 is 2^3 * 5. To arrive at this factorization, we break down 40 into its prime factors. We start by dividing 40 by the smallest prime number, 2. Since 40 is even, it can be divided by 2 evenly, resulting in 20. We continue this process until we can no longer divide by 2, which leaves us with 20. Now, we try to divide 20 by the next smallest prime, which is also 2. This division gives us 10. Once again, we divide by 2, and we are left with 5. Since 5 is a prime number, we cannot further divide it. Therefore, we have prime factorized 40 as 2 * 2 * 2 * 5, which can be expressed as 2^3 * 5, where the exponent 3 indicates that we have three 2s multiplied together, and the 5 is the prime factor on its own.

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Which expression simplifies...

Answers

Answer:

  see below

Step-by-step explanation:

If suffices to look at the last term. It must simplify to 4/(3w²), so the exponents of z must match in numerator and denominator, and the ratio of constants must reduce to 4/3.

The exponents of z have the right values in choices B and D, but the ratio of constants only matches in choice D. Looking at the rest of choice D, we see that we can factor 6w²z² from both numerator and denominator, then factor 2 from the remaining numerator to make it match the desired form.

  [tex]\dfrac{(12w^2z^4-24w^2z^2)}{18w^4z^2}=\dfrac{6w^2z^2}{6w^2z^2}\cdot\dfrac{2z^2-4}{3w^2}=\dfrac{2(z^2-2)}{3w^2}[/tex]

PLEASE HURRY!!! THANK YOU
1. There were 88 birds in the tree and then b of the birds flew away. Write an expression that shows how many birds are in the tree now.

2. Brice had $73 and then he earned d more dollars. Write an expression that shows how much money he has now.

3. Kurt's car gets 23 miles to a gallon of gasoline. He filled up his car's gas tank with g gallons. Write an expression that shows how far Kurt can drive on a tank of gasoline.

Answers

1. Answer: 88 - b
Explanation: there are 88 birds and then some of flying away. We know b is just a substitute for an amount of birds so it’s 88 - b

2. Answer: 73 + d
Explanation: he is earning d, amount of dollars, so you have to add the amount of dollars, d, to your original amount, 73

3: Answer: 23 x g
Explanation: We have 23 miles. If the car goes 23 miles to a gallon and we have g gallons then we would multiply to find how far he can drive.

How many groups of 14 are in 28?

Answers

Answer:

there are 2 groups

Step-by-step explanation: 14 x 2 = 28

Explain when you must write the number 1, and when you do not need to.

Answers

Answer:

The number 1 is not necessary when expressing powers of one. For example, you needn't write "5" as [tex]5^{1}[/tex].

Step-by-step explanation:

Final answer:

The number 1 is written when it is part of a larger number, as it is significant. It is not necessary to write leading zeros. In scientific notation, trailing zeros are excluded, and the number is written in a form where only non-zero digits appear before the decimal.

Explanation:

Understanding when to write the number 1 and when it's not needed depends on the context in mathematics, especially when dealing with significant figures and scientific notation. Generally, all non-zero numbers are considered significant (rule 1), which means that when a value like 1 is part of a larger number, it contributes to the meaning of that number. However, leading zeros do not count as significant (rule 3).

In the case of multiplication by units, like converting from kilograms to grams, we utilize the concept of multiplying by the number 1 to affect the units without changing the value. For example 0.7 kg can be multiplied by 1000/1 (1000 g / 1 kg) to convert to grams. This is because 1000/1 is equal to 1000, indicating multiplication by one does not change the value.

When expressing numbers in scientific notation, it's important to include the non-zero digits only before the decimal point, excluding any trailing zeros. Thus, 1,500,000 would be written as 1.5 x 106, with the power indicating the necessary number of decimal point movements to place it after the first significant digit.

Sarai is mixing a solution. She pours all the liquid from a full small beaker into a larger beaker. The liquid fills the large beaker to 15% of its capacity. If the small beaker holds 300 mL, how much does the large beaker hold?

Answers

Answer:

2000 ml

Step-by-step explanation:

Given: Sarai pours all the liquid from a full small beaker into a  larger beaker.

           The liquid fills the large beaker to 15% of its capacity.

            The small beaker holds 300 ml.

Lets assume capacity of large beaker to hold be "x".

As given, Sarai pours all the liquid from a full small beaker into a larger beaker

∴ [tex]15\% \times x= 300\ ml[/tex]

⇒ [tex]0.15x= 300[/tex]

Dividing both side by 0.15

⇒[tex]x= \frac{300}{0.15}[/tex]

∴ [tex]x= 2000\ ml[/tex]

Hence, the large beaker can hold 2000 ml of liquid.

A pen in the shape of an isosceles right triangle with legs of length x ft and hypotenuse of length h ft is to be built. If fencing costs $ 4 divided by ft for the legs and $ 16 divided by ft for the​ hypotenuse, write the total cost C of construction as a function of h.

Answers

Answer:

[tex]\frac{8h}{\sqrt{2}} + 16h[/tex]

Step-by-step explanation:

First we need to compute the side length as a function of h

So x be the side length of the right isosceles triangle, in Pythagorean formula we have

[tex]x^2 + x^2 = h^2[/tex]

[tex]2x^2 = h^2[/tex]

[tex]x = \frac{h}{\sqrt{2}}[/tex]

The cost for the legs is

[tex]C_l = 4*2x = \frac{8h}{\sqrt{2}}[/tex]

The cost for the hypotenuse is

[tex]C_h = 16h[/tex]

So the total cost in term of h is

[tex]C = C_l + C_h = \frac{8h}{\sqrt{2}} + 16h[/tex]

The total cost C of construction as a function of h is C =  16 / h +  8√2 / h

The pen is in the shape of an isosceles right angle. This means one of the

angle is 90 degrees and 2 sides of the triangle are equal and the base angles

are equal too.

Using pythagora's theorem

Therefore,

x² + x² = h²

2x² = h²

x² = h² / 2

x = √h²/ √2 = h/√2

cost of the legs = 4 / h/√2 + 4 / h /√2 = 8√2 / h

cost of the hypotenuse = 16 / h

Total cost = 16 / h +  8√2 / h

C =  16 / h +  8√2 / h

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How to do similar polygons?

Answers

Answer:

Similar polygon

Step-by-step explanation:

If two polygon similar then the ratio of the corresponding sides is the scale factor.All interior angles are congruent.

pls help I will mark brainlist if correct !! :))

Answers

You add all fruit and times to 3/8 to find strawberries

Multiply.
(x-6)(5x-4)
O
A. 5x^2-30x + 24
B. 5x^2 - 34x + 24
c. 5x^2 - 26x-24
D. 5x^2 - 30x-24​

Answers

use the FOIL technique (first outer inner last) to solve this.

FIRST: multiply the x and the 5x to get 5x^2

OUTSIDE: multiply the -4 and the x to get -4x

INNER: multiply the -6 and the 5x to get -30x

LAST: multiply the -4 and the -6 to get 24.

last step: put it all together to get 5x^2 - 4x - 30x + 24, which is 5x^2 - 34x + 24.

Good morning,
which of the following rational functions is graphed below? thanks​

Answers

Answer:

C.x/(x+5)(x-2)

Step-by-step explanation:

Answer:

b

Step-by-step explanation:

Someone help me with this please. I can’t figure It out.

Answers

Answer:

Complementary angles

Step-by-step explanation:

Complementary angles add up to 90 degrees

5) Find the equation of a line in slope-intercept form through the point
(3,-4) and perpendicular to the line x + y = 4.

Answers

Answer:

y = -x + 4

perp: m = 1

y + 4 = x - 3

y = x - 7

Step-by-step explanation:

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