Based on the graphs of $f(x)$ and $g(x)$ below, answer the following questions. You should not approximate any of your answers.

a) What is the average rate of change of $f(x)$ over the interval $\ 2.2 \leq x \leq 8 \ $ ?

b) What is the average rate of change of $g(x)$ over the interval $\ 2.2 \leq x \leq 6.1 \ $ ?