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

Answer:

see the explanation

Step-by-step 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

Answer 2

Answer:

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

Step-by-step explanation