Austin makes $10 an hour working as a cashier at a bookstore. His employer requires him to work at least 10 hours per week and his current school schedule limits him to a maximum of 25 hours per week.

1. Write an equation that represents Austin's gross pay where x represents the number of hours he works per week and f(x) (as in functions) represents his gross pay.

2. What is the domain and range in this situation?