Pre-calc algerbra question

Question

Determine the net change and the average rate of change for the function f(t)=t^(2)-3t between t= 3 and t= 3+h

Answer 1

The net change in this case is just

f(3 + h) - f(3).

You have the function f(t). Evaluate it at t=3+h and at t=3, and take the difference.

The average rate of change is

[f(3 + h) - f(3)] / [(3 + h) - 3] = [f(3 + h) - f(3)] / h