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Suppose you earn $7.21 per hour and plan to work "h" hours per week. write an expression using variables that models the amount of money you will earn each week.
Then, suppose you earn $10 in tips per week, regardless of the hours you work. How does this change the equation

11th grade math 
MathMate,
If you earn $7.21 per hour and work 8 hours a week. How much do you earn?
If you earn $7.21 per hour and work h hours a week. How much do you earn?
Since the tips of $10 per week is independent of the number of hours worked, simply add $10 to the weekly pay.