(1 point) A 9-year projection of population trends suggests that t years from now, the population of a certain community will be
P(t) = t³ +21² + 47t + 40
thousand people.
(a) At what time during the 9-year period will the population be growing most rapidly?
(b) At what time during the 9-year period will the population be growing least rapidly?
(c) At what time during the 9-year period will the rate of population growth be growing most rapidly?
