Answer
Net change: $35$
Average Rate of change: $\frac{7}{4}$
Work Step by Step
From the chart, we are given the following points:
$(10,-5) (20,-2) (30, 30)$
The net change from x=10 to x=30 is $f(30) - f(10) = 30 - (-5) = 35$
Average Rate of change: $\frac{f(30) - f(10)} {30-10} = \frac{35}{30-10} = \frac{7}{4}$
