To compare the dry braking distances from 30 to 0 miles per hour for two makes of​ automobiles, a safety engineer conducts braking tests for 35models of Make A and 35 models of Make B. The mean braking distance for Make A is 41feet. Assume the population standard deviation is 4.6 feet.The mean braking distance for Make B is 45feet. Assume the population standard deviation is 4.3 feet.At alphaequals0.10​,can the engineer support the claim that the mean braking distances are different for the two makes of​ automobiles

There is sufficient evidence to support the claim.

Step-by-step explanation:

Given

Make A

Make B

First, we state the null and alternate hypothesis

Next, calculate test statistic:

The critical value at is:

So, we reject

This implies that; there is sufficient evidence to support the claim.

The answer to your question is (f + g) (-2) = -20

Step-by-step explanation:

Data

L(x) = x² - 20

g(x) = 2x

(f+ g)(-2) = ?

Process

1.- Calculate (f + g) (x)

(f + g) (x) = x² - 20 + 2x

- Simplification

(f + g) (x) = x² + 2x - 20

2.- Evaluate (f + g)(x) in -2

(f + g)(-2) = (-2)² + 2(-2) - 20

-Simplification

(f + g)(-2) = 4 - 4 - 20

3.- Result

(f + g) (-2) = -20