We have that
p(t)=-3t^2+18t-4
using a graphing tool, we can see the maximum of the graph
(see the attached figure)
A) In what year of operation does Mr. Cash’s business show maximum profit?
Mr. Cash’s business show maximum profit at year 3 (maximum in the parabole)
B) What is the maximum profit?
23 (hundred of thousand of dollars) = 2.300.000 dollars
c) What time will it be two late?
(This is the time when the graph crosses zero and the profits turn into losses )
5.77 years, or an estimate of about 69 months.