$3\mathrm{.}4$ Homework

Question $13,3\mathrm{.}4\mathrm{.}49-$BE

Part $1$ of $2$

An employee's monthly productivity $M,$ in number of units produced, is found to be a function of the productivity and the year in which it is achieved.

$M(t)=-3t^2+120t+120,0t40$