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2 years ago

HELP WHICH ARE CORRECT ??

Mathematics

1 answer:

alexandr402 [8]2 years ago

8 0

The second (-35 + 21x) and the fourth one (21x-5) are true. The rest of them are false.

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In its Fuel Economy Guide for 2016 model vehicles, the Environmental Protection Agency gives data on 1170 vehicles. There are a

Nady [450]

Answer:

a. 19.68 miles per gallon.

b. 26.32 miles per gallon.

Step-by-step explanation:

Mean gas mileage (μ) = 23.0 mpg

Standard deviation (σ) = 4.9 mpg

In a normal distribution, for any length X, the z-score is determined by the following expression:

$z=\frac{X-\mu}{\sigma}$

In a normal distribution, the 25th percentile (first quartile) of a normal distribution has a corresponding z-score of z = -0.677 and the 75th percentile has a corresponding z-score of z = 0.677

a. The first quartile of the distribution of gas mileage is

$-0.677=\frac{X_{25}-23}{4.9}\\X_{25}=19.68\ mpg$

19.68 miles per gallon.

b. The third quartile of the distribution of gas mileage is

$0.677=\frac{X_{25}-23}{4.9}\\X_{25}=26.32\ mpg$

26.32 miles per gallon.

5 0

3 years ago

PLEASE ANSWER THIS FOR ME!

alex41 [277]

Answer:

x = (180-147)/3

x = 11

Step-by-step explanation:

7 0

2 years ago

does anyone know how to change your age on here? i went to preferences, but it didn't come up. it keeps saying i am 49 but im ac

Sidana [21]

Answer:

Sorry to break it to you

Step-by-step explanation:

i am actually 13 and i put my age at 63 and so when i tried to change it. It would not work so you need to make a new account if you want to

8 0

2 years ago

What is the value of cos(150°)?

baherus [9]

ANSWER

$-\frac{\sqrt[]{3}}{2}$

EXPLANATION

Given

$\begin{gathered} \cos \text{ 150} \\ \end{gathered}$

We can find cos 150 by using

$\begin{gathered} \cos (180-\theta)=-\cos \theta \\ \Rightarrow\cos (180-\theta) \\ =-\cos 30 \end{gathered}$

recall that

$\begin{gathered} \cos 30=\frac{\sqrt[]{3}}{2} \\ \end{gathered}$

Hence,

$\begin{gathered} \cos 150=-\cos 30 \\ =-\frac{\sqrt[]{3}}{2} \\ \end{gathered}$

Therefore, the value of cos 150 is

$-\frac{\sqrt[]{3}}{2}$

4 0

9 months ago

Quinn is determining the area of a trapezoid. His work is shown below. mc012-1.jpg Step 1: Break the figure into rectangles and

lbvjy [14]

The answer is C.The area of the triangle in Step 3 should be doubled since there are 2 triangles.

6 0

3 years ago

Read 2 more answers