4.1 Review Worksheet (continued)
Identify the independent and dependent variables. Write a rule in function notation for each situation. 21. To rent a DVD, a customer must pay $3.99 plus $0.99 for every day that it is late.
22. Stephen charges $25 for each lawn he mows.
23. A car can travel 28 miles per gallon of gas.
24. A mail-order company charges $5 per order plus $2 per item in the order, up to a maximum of 4 items. Write a function rule to describe the situation. Find a reasonable domain and range for the function.
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