Which one is correct? Please hurry <3

The table respent two linear functions the equation respented by the first tables is given

Part a: sam rented a boat at $225 for 2 days. if he rents the same boat for 5 days, he has to pay a total rent of $480. write an equation in the standard form to represent the total rent (y) that sam has to pay for renting the boat for x days. (4 points)

How to find the exponential function y=ca^x, with points (1,2) and (2,1)