The Big Joe advertising company finds that profits on day t of a Facebook advertising campaign is given by P(t) = -3.46t2 + 70t+ 15,000 where P(t) is the profits in dollars for day t of the campaign. a) What are the profits on day 5 and day 13 of the campaign? Summarize your answer in complete sentences. b) Find the marginal profit function MP(t) = P'(t) c) What is the rate of change in profits for day 5 of the advertising campaign? Day 13? Summarize your answer in complete sentences.