Problema Solution
Jerry started doing sit-ups every day. The first day he did 14 sit-ups. Every day after that he did 2 more sit-ups than he had done the previous day. Today Jerry did 18 sit-ups. Enter an equation that could be solved to find the number of days Jerry has been doing sit-ups, not counting the first day.
Answer provided by our tutors
The first day Jerry did 14 sit-ups:
a0 = 14
The 2nd day he did 2 more sit-ups then the previous:
a1 = a0 + 2
The 3rd day he did 2 more sit-ups then the previous:
a2 = a1 + 2
a2 = a0 + 2 + 2
a2 = a0 + 2*2
the (n+1)-th day he did:
an = a0 + 2n
Today Jerry did 18 sit-ups means we have: an = 18 and we need to find n
a0 + 2n = 18
14 + 2n = 18
........
click here to see all the equation solution steps
........
n = 2
Jerry has been doing sit-ups for 2 days (not counting the first day).