a. b. The red squirrel population, p, in a neighbourhood park can be modelled by the function p(t) = 420t - , where t is time, in years. 2 Determine the rate of growth of the squirrel population at t = 5 years. When will the population reach 60 squirrels? What is the instantaneous rate of change of the population at the time in b)? When is the instantaneous rate of change of the squirrel population approximately 7 squirrels per year?