Bailey and Marcus buy a dog that weights 18 pounds. The dog gains 2 3/4 pounds each year. The dog now weighs 34 1/2 pounds. How many years ago did Bailey and Marcus buy the dog

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.