Answer
Net Change: -4
Average Rate of Change: -1
Work Step by Step
From the chart, we are given the following points:
$(4,12) (6,12) (8,8)$
The net change from x=4 to x=8 is $f(8) - f(4) = 8 - 12 = -4$
Average Rate of change: $\frac{f(8) - f(4)} {8-4} = \frac{8-12}{8-4} = -1$
