Help please help I have an f for math lol

Given the graph below state whether or not the relation is a function, and give the domain and range.

Find the missing dimension extra points

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.