What single discount is equal to a discount of 1/4 off followed by an additional 10% off the sale price?

Thelime contains the point(-3,0) and parallel x-3y=3( show all work)

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?

Factor and solve to find roots x squared -x - 90 =0