What is the answer to this

in a sale there is 10 per cent off all prices. a chair costs 63 pounds in the sale how much was it before the sale

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

Louis wants to carpet the rectangular floor of his basement.the basement has an area of 864 square feet.the width of the basement is 2/3 it's length. what is the length of louis's basement