Question: COST OF WIRELESS PHONE CALLS As cell phone usage continues to soar, the airtime costs have dropped. The average price per minute of use (in cents) is projected to be
f(t) = 31.88(1 + t)-0.45 (0 ≤ t ≤ 6)
where t is measured in years and t = 0 corresponds to the beginning of 1998. Compute f'(t). How fast was the average price/minute of use changing at the beginning of 2000? What was the average price/minute of use at the beginning of 2000?