The expression n2 + n represents the total number of blocks used in the nth figure of a pattern. use the equation n2 + n = 56 to determine which figure has 56 blocks.

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.