Question

Jerry started doing sit-ups every day. The first day he did 19 sit-ups. Every day after that he did 4 more sit-ups than he had done the previous day. Today Jerry did 81 sit-ups. Write an equation that could be solved to find the number of days Jerry has been doing sit-ups, not counting the first day. Let n represent the number of days.
( i need it as a expression)

Answer 1

The answer is 2n + 15 = 33 have a good day