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Josefina works between 10 and 30 hours per week at a pizzeria. She earns $6.50 an hour, but can earn tips when she delivers pizza.
a) Write a system of inequalitites to represent the dollars 'd' she could earn for 'h' hours in a week.
b) If Josefina recieved $17.50 in tips and earned a total of $180 for the week, how many hours did she work?
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