How to find net change

Question

A function is given.

f(x) = 9x − 3;    x = 2, x = 3

(a) Determine the net change between the given values of the variable.

(b) Determine the average rate of change between the given values of the variable.

Answer 1

Net change: f(3) - f(2)

Average rate of change: [f(3)( - f(2)] / (3 - 2)