Question 919567
A) {{{f(t) = t(t^3+ 44t^2 - 612t + 2592)}}}
B) In 1985, {{{t=5}}}
{{{f(5)=5(125+44(25)-612(5)+2592)}}}
{{{f(5)=3785}}}
C) {{{f(15)=15(3375+44(225)-612(15)+2592)}}}
{{{f(15)=100305}}}
Business is good.
D) Profits are increasing year by year.
{{{graph(300,300,-5,20,-5000,200000,x^4+44x^3-612x^2+2592x)}}}