Ed is doing a survey of popular colors for cars for a school report. He decides to take a sample by sitting near a busy intersection and noting the colors of the cars as they go by him. Ed counts 23 black cars, 9 red cars, 17 blue cars, 25 white cars, and 21 silver cars during 20 minutes of watching. How many more white and blue cars are there than silver and red cars?

Answers

Answer 1

Answer: The answer is 12.

If we represent the cars in this way:
Black cars A = 23
Red cars B = 9
Blue cars C = 17
White cars D = 25
Silver cars E = 21

Then sum of white and blue cars is D + C = 25 + 17 = 42
And the sum of silver and red cars is E + B = 21 + 9 = 30

Using the subtraction:
(D+C) - (E+B) = 42 - 30 = 12

Therefore, there are 12 more white and blue cars than silver and red cars.

Answer 2

Answer:

Answer:

Step-by-step explanation:

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The greatest common factor of 3m2n + 12mn2 is
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What is the volume in cubic feet of a greenhouse that is 20 ft long, 15 ft wide, 10 ft high

Answers

To do this multiply the three numbers together. 20 times 15 is 300 and 300 times 10 is 3,000. So the volume would be 3,000 feet cubed.

Consider the function f(x) = 4x2 + 5. Find the value of f(x) when x = 2 and select the correct answer below.

Answers

Simply plug two in for x :)
f(2) = 4(2) × 2 + 5
f(2)=8 × 2 + 5
f(2)=16 + 5
f(2)=21
There's your answer :) (I just assumed that 2 was being multiplied when you said 4x2)

its supposed to be 4x^2.

What's the Discriminant of X^2-2X-15 ?

Answers

the discriminant is the secion inside the double parenthasees [()] below in the quadratic formulat which is
x= $\frac{-b+ \sqrt{[(b^(2)-4ac)]} }{2a}$

the determinant determines or tells whether the answer is real or imaginary
if it is negative, then it is imaginary, if positive, then it is real
so basically the discriminmant is $b^(2)-4ac$

so ax^2+bx+c
a=x^2-2x-15

a=1
b=-2
c=-15

subsitute
$-2^(2)-4(1)(-15)$ =4-4(1)(-15)=4+60=64
the discriminant is ( $-2^(2)-4(1)(-15)$ ) or 64

To determine customer opinion of their pricing, Home Depot randomly selects 140 check out lines during a certain week and surveys all customers in the check out lines. What type of sampling is used?

Answers

Answer: Cluster sampling

Step-by-step explanation:

A cluster sampling is a kind of random sampling technique in which the researcher splits the whole population into distinct sets known as clusters.

After that, he choose a random sample of clusters from the population and do analysis on it.

In the given situation, the objective of survey : "To determine customer opinion of their pricing:".

He first divides the number of check out lines according to weeks and randomly selects 140 check out lines during a certain week and surveys all customers in the check out lines. .

(Here , check out lines = clusters )

Therefore , the type of sampling is used = Cluster sampling

Cluster sampling is used by Home Depot for a certain week and surveys all customers in the check out lines.

A cluster sampling is a kind of random sampling technique in which the researcher splits the whole population into distinct sets known as clusters.

Given, Home depot randomly selects 140 check out lines.

In the given situation, the objective of survey : "To determine customer opinion of their pricing:".

He first divides the number of check out lines according to weeks and randomly selects 140 check out lines during a certain week and surveys all customers in the check out lines. .

Here , check out lines = Clusters

Therefore , the type of sampling used is Cluster sampling .

Know more about cluster sampling,

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In triangle ABC, the perpendicular bisector of side AB intersects the extension of side AC at point D. If ∠CBD = 16° and ∠ACB = 118°, find the measure of ∠ABC. A. 16 degrees B. 44 degrees C. 62 degrees D. 74 degrees

Answers

Answer:A

Step-by-step explanation:

To find the measure of angle ABC in triangle ABC, we can use the properties of perpendicular bisectors.

Since the perpendicular bisector of side AB intersects the extension of side AC at point D, we know that AD = DB. Therefore, triangle ABD is an isosceles triangle.

In an isosceles triangle, the angles opposite the equal sides are also equal. So, we have:

∠ABD = ∠ADB

Since ∠CBD = 16° and ∠ACB = 118°, we can find ∠ADB as follows:

∠ADB = 180° - ∠CBD - ∠ACB

= 180° - 16° - 118°

= 46°

Since ∠ABD = ∠ADB, we have:

∠ABD = 46°

Now, we can find ∠ABC:

∠ABC = 180° - ∠ABD - ∠ACB

= 180° - 46° - 118°

= 16°