Answer:
1
Explanation:
To find the average rate of change, you have to use this formula:
, when a and b are the x and y coordinates of the problem.
To find f(b) and f(a), you have to insert -2 and 1 for f(x) because a = -2 and b=1. (So you would do f(1)=1 and f(-2)=-2). Doing this will give you 1 and -2 when f(b) is 1 and f(a) is -2.
So because we have the f(b) and f(a), we can insert this in the formula.

So that is how the original problem's answer is 1.
I hope this helped!
(Also I would LOVE to get brainilest, I'm trying to get to the expert status)