The gross domestic product (in billions of dollars} can be approximated by P{t]| = 56?+tl:3?t'5 103} . where t is the number of years since 1960. 3] Find P't}. b} Find P'I[42}. c} In words, explain what P'E42} represents. 3] Find P'm. swam by Find P142). P':42)=D {Simplify your answer. Type an integer or decimal rounded to the nearest tenth as needed.) a] In words, explain what P'E42} represents. In the year 2002 , the gross domestic product was by about '1 billion dollars per year. [Type integers or decimals.)