List the numbers in order from least to greatest

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)

I’m still confused on how to work the percentages

Which is the focus of a parabola with equation y2=4x