PLEASE HELP ASAP (timed assignment)

Aidan is on vacation and needs to arrange transportation. A rental car costs 45 dollars per day plus a one-time cost of 15 dollars for insurance. Construct a function C(x) that gives the total cost of renting a car for x days.

C(x)=________

If Aidan has budgeted 195 dollars for the rental, how many days can he afford?