HELP NEEDED ASAP ALGEBRA 1 KHAN ACADEMY

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

Need on this geometry question. explain how you did it.

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).