What number is in between 3.0 and 3.5

Does anyone know how to do geometryme with this problem

X2 + y 2 = 36 x + y = 6 solve the system of equations.

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)