Which expression is equivalent to −40+(−20)+(−60) ?

−20+(−40)+(−60)

−40−(20−60)

−(40−20)+(−60)

40+20+60

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.