which statemnet describes a situation that can be represented by an exponential function? A. the value of a stock decreases by 5% every month B. A customer pays a restaurant bill of $18 and leaves a 20% tip. C. A canoe remtal company charges am initial fee of $13 and an hourly rate of $8 D. The area of a square increases by 400% when the length of each of the side of the square increases from 6 units to 12 units