The image of parallel lines after a rigid transformation is

Two lines parallel to the same plane are parallel to eachother

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 value would be a solution for x in the inequality 47-4x< 7