In t years, the population of a certain city grows from 200,000 to a size P given by P(t) = 200,000 + 3000t2. a) Find the growth rate, dP dt b) Find the population after 10 yr. c) Find the growth rate at t=10. d) Explain the meaning of the answer to part (c). a) dt b) The population after 10 yr is (Simplify your answer.) c) The growth rate at t = 10 is (Simplify your answer.) d) What is the meaning of the answer to part (c)? OA. The growth rate tells the difference between the rate of growth at the beginning of t=0 and t = 10. OB. The growth rate tells the average growth from time t=0 and t= 10. OC. The growth rate tells the rate at which the population is growing at time t = 10.