Question

A water park charges a rental fee plus $2.00 per hour for lockers. The total cost of 5 hours is $13.00. Assume the relationship is linear. Find the rate of change and the rental fee.

Answer 1

• rate of change: $2 per hour
• rental fee: $3

Explanation:

You want the rate of change and the rental fee if the charge for 5 hours including the rental fee is $13 and the per-hour charge is $2.

Rate of change

The rate of change is the per-hour charge: $2 per hour.

Rental fee

The hourly charge for 5 hours is 5($2) = $10, so the rental fee is ...

fee + $10 = $13

fee = $3

The rate of change is $2 per hour, and the rental fee is $3.

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