A12 inch candle and 18 inch candles are lit at 6 pm the 12 inch candle is thicker and only burn 0.5 inches every hour the 18 inch candle is taller and burns 2 inches every hour at what time will the two candles be the same height

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.