1. Find the value of c in [1, 9] such that h(c) is the average value of h(t) = 1/t on [1, 9].
2. Suppose the temperature in a town in °C t hours after 3 AM is given by
T(t) = 20 - 15 sin (πt/6).
3. Find the average temperature during the period from 6 AM to 9 AM.