The number of presents p that Tim can afford to buy varies inversely with their average cost C (in dollars). It Tim can afford 5 presents when their average cost is $12, what average cost would 3 presents have?

Describe the end behavior of the function below. f(x)=(2/3)^x-2 a. as x increases, f(x) approaches infinity. b. as x decreases, f(x) approaches 2. c. as x increases, f(x) approaches -2. d. as x decreases, f(x) approaches negative infinity.