Answer:
Carmen has to work 9 hours to make $153.
Explanation:
Well first we would need to find out how much she makes an hour, so to do that we would divide the 221 by 13 hours and get 17. Then you just keep multiplying until you have the right number.
17x4=68
17x5=85
17x6=102
17x7=119
17x8=136
17x9=153