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yulyashka [42]
3 years ago
7

Identify which study method is illustrated by each example: a. The local department of transportation is responsible for maintai

ning lane and edge lines on its paved roads. There are two new paint products on the market. Twenty comparable stretches of road are identified. Paint Ais randomly assigned to ten of the stretches of road and paint B to the other ten. The department finds that paint B lasts longer.​
Mathematics
1 answer:
Nonamiya [84]3 years ago
8 0

Answer:

Experiment

Step-by-step explanation:

There is a “treatment” being applied which in this case is changing the environment which makes it and experiment

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The scale on a model railroad train set is 3.5 millimeters to 1 foot. If the length of a model car in the set is 150 millimeters
Vera_Pavlovna [14]

Answer:

The approximate length of the actual car is <u>43 feet</u>.

Step-by-step explanation:

Given:

The scale on a model railroad train set is 3.5 millimeters to 1 foot. If the length of a model car in the set is 150 millimeters.

Now, to find the approximate length of the actual car.

Let the actual length of the car is x.

The length of a model car in the set is 150 millimeters.

As, given the scale on a model railroad train set is 3.5 millimeters to 1 foot.

<em>So, 3.5 millimeters equivalent to 1 foot.</em>

<em>Thus, 150 millimeters to </em>x<em>.</em>

Now, to get the actual length of the car by using cross multiplication method:

\frac{3.5}{1} =\frac{150}{x}

<em>By using cross multiplying we get:</em>

3.5x=150

<em>Dividing both sides by 3.5 we get:</em>

x=42.85\ feet.

<em><u>The approximate length of the actual car = 43 feet.</u></em>

Therefore, the approximate length of the actual car is 43 feet.

3 0
3 years ago
Read 2 more answers
Which of the following scales of measurement lacks numeric properties?
Rus_ich [418]

Answer: A

Step-by-step explanation:

The nominal scale by definition only deals with non-numeric or non-quantitative variables or where numbers have no numerical value. The nominal scale uses tags or labels instead of number to classify or identify an object being measured.

5 0
3 years ago
Slope of the line (5,4) and (8,2)
GenaCL600 [577]
2/-3 by using the formula y2-y1/x2-x1
5 0
4 years ago
In square ABCD shown to the right, the area of parallelogram AECF is 24. The perimeter of ABCD is:
kompoz [17]
Area of parallelogram = a x h = 24 (a = length of side) (is 'a' given in your question?)if so you can find h by, h=24/aThen the area of square is = hxh
8 0
3 years ago
N is a multiple of 5
juin [17]

Answer:

Proved

A^2 - B^2 = 20, 40,60,80...

Step-by-step explanation:

Given

A = N + 1

B = N - 1

Required

Prove that A\² - B\² is a multiple of 20

First, we need to evaluate A\² - B\²

Start by applying difference of two squares

A\² - B\² = (A + B)(A - B)

Substitute values for A and B

A\² - B\²= (N + 1 + N - 1)(N + 1 -(N-1))

A\² - B\² = (N + 1 + N - 1)(N + 1 - N + 1)

Collect Like Terms

A\² - B\² = (N  + N+ 1 - 1)(N - N  + 1+ 1)

A\² - B\² = (2N)(2)

A\² - B\² = 2N*2

A\² - B\² = 4N

Since, N is a multiple of 5, then the possible values of N are:

N = 5, 10, 15, 20...

For each of these values, the possible values of A^2 - B^2 are

A^2 - B^2 = 4N: 4 * 5, 4*10,4*15,4*20...

A^2 - B^2 = 20, 40,60,80...

The above shows that A^2 - B^2 is a multiple of 20

5 0
3 years ago
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