The number of Drosophila fruit flies in a controlled experiment assumes the following growth pattern when the food source is limited:

Question

N(t) = 120/(1+11e^(−0.4t))

D. At what rate is the number of fruit flies increasing after 4 days?

Answer 1

dN/dt = 528e^0.4t / (11+e^0.4t)^2

Now just plug in t=4