State the domain and range and determine if its a function?

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

Solve the equation by completing the square. x^2+2x=17

An octagonal prism has jow many lateral faces?