QUESTION $7$: $[5$ points$]$

The number $of$ acres $in$ a region cleared for farming follows the formula $A=f(t)=2t^2$ where

$tis$ the number $of$ months since the region started $tobe$ farmed and $t$ ranges from $t=0to$

$t=10.$ Find the average rate $of$ change $in$ the number $of$ acres cleared for farming between

$t=1$ and $t=4.$ Give units with your answer.

$A10$acre$\frac{s}{y}$ear

$B$