Rachel fills 13 water bottles per hour. Alyssa fills 15 bottle of water per hour. This week Alyssa filled an additional 5 bottles of water. Write an expression that represents the weekly water of bottle filled. R=the number of hours that Rachel filled bottles this week. A=the number of hours Alyssa filled the bottles this week.
Rachel fills 13 water bottles per hour, so she contributes 13R. Alyssa fills 15 bottles an hour, so she contributes 15A, plus 5 for the additional water bottles filled. Thus, the full expression is: 13R+15A+5