A small company of science writers found that its rate of prot (in thousands of dollars) after t years of operation is given by the function below. 1 P'(t) = (9t+ 9) (t2 +2t+2) 5 a. Find the total prot in the rst three years. b. Find the prot in the fourth year of operation. c. What is happening to the annual prot over the long run? a. The prot in the rst three years is 55']. (Round to the nearest dollar as needed.)