#### Answer

Net change: -4
Average rate of change: -1

#### Work Step by Step

We find the net change from $x=4$ to $x=8$:
$f(8)-f(4)=8-12=-4$
Next we find the average rate of change for this interval:
$\frac{f(8)-f(4)}{8-4}=\frac{-4}{4}=-1$

Published by
Brooks Cole

ISBN 10:
1305115546

ISBN 13:
978-1-30511-554-5

Net change: -4
Average rate of change: -1

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