Question

What is the average rate of change for ƒ(x) = −3x + 79 over the interval 2 ≤ x ≤ 4? A) −124 B) −18 C) −36 D) −96

Answer 1

if you are using usatestprep the answer is C. -36

Step-by-step explanation

Answer 2

see the explanation

Explanation:

we have

`f(x)=-3x+79`

This is a linear function in slope intercept form

`f(x)=mx+b`

where

m is the slope

b is the y-intercept

In this problem

The slope is equal to

`m=-3`

Remember that

In a linear function the average rate of chance is a constant and is equal to the slope of the linear function in any interval

therefore

The average rate of change is -3