Write the monomial in its standard form and name its coefficient: 8x^2x

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

Ineed in figuring out this problem.

What is the difference between the equations of a vertical and a horizontal line?