Find x please help me

Name the most appropriate metric unit for each measurement

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

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?