I am having trouble with this problem:

In a healthy person of height h inches, the average pulse rate (beats per minute) is modelled by the function

P (h)=596/sqrt (h)

1) compute the sensitivity of P at h=60

2) based on 1), estimate the change in pulse rate corresponding to a height change from 59 to 60 inches.

3) computer the elasticity of P. Does it depend on h?

4) use 3) to determine how accurate a measurement of h needs to be in order to ensure the estimate for P is within +or- 10%.

Thank you ahead of time!!