Linear equation help

Question

I want to write a linear equation that can be used to calculate the total rental car cost (RC) for any number of days. Use the variable ‘D’ for the number of days to rent the car.​

Answer 1

You don't really give much to go on but here goes nothing;

D = the number of days to rent the car.

C = Cost to rent a car for D number of days

R = Car Rental rate (dollars per day) that they charge.

Assuming that there are no flat fees for misc charges, then:

C = RD

If there are fees associated with renting (taxes, use fees, car rental facility fee, whatever), then we could add this costs in as well. Some of them might be based on a percentage of the car rental cost. Others might be flat fees that are regardless of overall cost. So we can treat them as two different variables:

F1 = Fees, taxes, and other charges that are based on the rental car cost (a percent written as a decimal)

F2 = Flat fees and charges charged regardless of rental car cost (written as a dollar value)

Then the equation would be:

C = RD(1 + F1) + F2