A satellite dish is shaped like a parabloid of revolution, the signals that emanate from a satellite strike the surface of the dish and are reflected to a single point, where the receiver is located. If the dish is 16 feet across at its opening and 2 feet deep at its center. At what position should the receiver be placed? How do you solve this and what is the answer? EDIT: Okay, after applying (8,2) to the formula y=(1/4z)x^2 the answer is z = 8. Thank you all who helped.