just need to solve (d) and (e)

At time t = 0, a bacterial culture weighs 4 grams. Three hours later, the culture weighs 16 grams. The maximum weight of the culture is 80 grams. (a) Write a logistic equation that models the weight of the bacterial culture. (c) When will the culture's weight reach 75 grams? (Round your answer to two decimal places.) -\"" (d) Write a logistic differential equation that models the growth rate of the culture's weight. Then repeat Part(b) using Euler's Method with a step size of h = 1. (Round your answer to the nearest whole number.) [2 145) = (e) At what time is the culture's weight increasing most rapidly? [Round your answer to two decimal places.) [:J"r