I'm having difficulty with this question. All help is appreciated. *The cross section of television antenna dish is a parabola and the receiver is located at the focus. A. If the receiver is located 5 feet above the vertex, assume the vertex is the origin, find an equation for the cross section of the dish. Okay, I know the vertex is 0,0. The focus is 0, 5. The equation is x^2=4ay. I don't know where to go from there, or what equation is needed to find the cross section.