Try another version of this question
A satellite dish is shaped like a paraboloid of revolution. This means that it can be formed by rotating a parabola around its axis of symmetry. The receiver is to be located at the focus. If the dish is 40 feet across at its opening and 5 feet deep at its center, where should the receiver be placed?
nasa.gov
Find the equation of the parabola.
How far above the vertex should the receiver be placed?
`x^2=80 (y+5)`
20
feet