Final answer:
The question pertains to calculating the total cost of renting snorkeling gear given a fixed fee and a variable fee based on time. The dependent variable is the total fee, and the independent variable is the number of hours the gear is rented. Without the specific cost per 20-minute interval, we cannot calculate the exact total cost.
Step-by-step explanation:
The question is asking for the total cost of renting snorkeling gear, which includes both a fixed insurance fee and a variable fee based on 20-minute intervals. Since the problem only provides information about the fixed fee being $25 and the cost of 20-minute intervals, we could infer that the latter part is similar to a linear equation example where the resort charges an hourly fee when renting scuba equipment. In the example provided, the up-front fee is $25 (a fixed fee), and there is a variable hourly rate of $12.50.
To answer the question for Amy's snorkeling gear, if the scenario is analogous to the scuba equipment rental:
The dependent variable would be the total fee, as it depends on the number of hours the equipment is rented.
The independent variable would be the number of hours the equipment is rented because it is the variable that Amy can change.
The equation expressing the total fee in terms of the number of hours the equipment is rented would be:
Total Fee = (Hourly Rate × Number of Hours) + Fixed Fee
However, to determine the exact total cost for Amy, we would need the specific cost per 20-minute interval for renting the snorkeling gear, which is not provided in the question. Therefore, we cannot calculate Amy's total cost without that information.