Question $25(Mandatory)(1$ point$)$

The population $of$ a town $is$ modelled $byP(t)=-t^2+12t+4,$ where $P(t)is$ the size $of$ the

population $in$ thousands and $tis$ the number $of$ years since $2000.$ What $is$ the

average rate $of$ change $in$ the population size from $2005to2010?$

$a$