A: add up all the money he deposited 3.98+51.02+38.52+12.70=$106.22 and all the money withdrew: -5.23-5.22-3.50-4.39=-18.34
b- 3.50, 3.98, 4.39, 5.22, 5.23, 12.7 38.52 51.02 just look at the digits from left to right the bigger they are the bigger the number is.if they were equal look at the next digit: example: 3.50 and 12.7 there is a 1 in 12.7 tenth place but 3.50 doesn't even have a tenth place(or rather, it has a zero on it's tenth place) so 12.7 is bigger than 3.50
c-add all deposits and subtract all withdrawals: 106.22+98-18.34=185.88
