21. [-/1 Points] DETAILS LARAPCALC10 2.4.065. MY NO A population of bacteria is introduced into a culture. The number of bacteria P can be modeled by P = 400 1 + 3t 60 + +2 where t is the time (in hours). Find the rate of change of the population at t = 2. (Round your answer to two decimal places.) bacteria/hour Need Help? Read It 22. [-/6 Points] DETAILS LARAPCALC10 2.4.068. MY NOTE The temperature 7 (in degrees Fahrenheit) of food placed in a refrigerator is modeled by T = 10 212 + 16t + 71 12 + 2t + 10 where t is the time (in hours). What is the initial temperature of the food in degrees Fahrenheit? OF Find the rate of change of T with respect to t (in .F/hr) at the following values. (Round your answers to two decimal places.) (a) t = 1 OF/hr (b) t = 3 OF/hr (c) t = 5 OF/hr (d) t = 10 OF/hr