Sam has $25 but owes a friend. He doesn't want to depart with his money all at once, so he agrees to pay him back $2 a day. Which expression represents the amount of money he has left?
A~ x(25 -2)
B~ 2(25 +x)
C~ 25 - 2x
D~ 25 + 2x

Question

Vocaloid · Answer

on day 0 (before he makes any payments) he has 25 dollars
on day 1, he pays two dollars and has 25 - 2 = 23 left
on day 2, he pays two dollars and has 25 - 2(2) = 21 left
on day x, he pays two dollars and has _________ left

what sort of expression do you think might go into the blank?