Two fifths of a number equals 564. what is the number

15 point ! ~ see if you know the answer to both you!

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 is a graph of a proportional relationship?