Driving costs the average cost of owning and operating a

Question

Question: DRIVING COSTS The average cost of owning and operating a car in the United States from 1991 through 2001 is approximated by the function

C(t) = 0.06t² + 0.74t + 37.3          (0 ≤ t ≤ 11)

where C(t) is measured in cents/mile and t is measured in years, with t 0 corresponding to the beginning of 1991.

a. Plot the graph of C in the viewing window [0, 10] × [35, 52].

b. What was the average cost of driving a car at the beginning of 1995?

c. How fast was the average cost of driving a car changing at the beginning of 1995?