Question

What is the average rate of change of f over the interval [-3,9]

Answer 1

The average rate of change of a function on an interval [a, b] is equal to $\frac{f(b)-f(a)}{b-a}$. So, the average rate of change of f on the interval [-3, 9] is equal to $\frac{f(9)-f(-3)}{12}$.