The heart rate of a runner after finishing a race is modeled by the function, R(n) =120(0.75)" + 60 where R is the heart rate in beats per minute (bpm) and n is the number of minutes afterfinishing the race. a) Find the average rate of change of heart rate from n = 0 to n = 5 R(3 + h) R(3) for: b) Estimate the instantaneous rate of change at n = 3 by evaluating h 1) h=0.1 2) h=0.01 3) h = 0.001