Find the volume of a cone with diamter 12 and height 8

For the equation below, x is the input and y is the output. y = -4x + 3 if the input is -8, then the output is

How do you answer this question? (step by step)

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)