After t years, the value of a car purchased for $25,000 is V(t) = 25,000(3/4)^t.

(a) Use a graphing utility to graph the function and determine the value of the car 2 years after it was purchased.
(b) Find the rates of change of V with respect to t when t = 1 and t = 4.
(c) Use a graphing utility to graph V'(t) and determine the horizontal asymptote of V'(t). Interpret its meaning in the context of the problem.