David can type a 50-page paper in 8 hours. Last month, David and Andy together typed a 50-page paper in 6 hours. How long would Andy take to type a 50-page paper by himself?

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)