A rental car agency charges $24.60 per day and 8 cents per mile. Use a formula to express the cost of renting a car, in dollars, as a function of the number of days (d) you keep it and the number of miles (m)

Total Cost = 24.60 x + 0.08 y where x is the number of days and y is the number of miles.

Explanation:

Let x be the number of days and y be the number of miles then the total cost TC of renting a car per day would be

Total Cost = Cost per day (number of days) + Cost per mile (no of miles)

Total Cost = 24.60 x + 0.08 y

Suppose we rent a car for 5 days and use it 30 miles then the total cost would be

Total Cost = $ 24.60 (5) + 0.08 (30)

Total Cost = $123 + 2.4 = $ 125.4

so the total cost of renting a car for 5 days and using it 30 miles would be $ 125.4