A Satellite Dish Measures 72 Feet Across Its Opening and 9

Multiple Choice

A satellite dish measures 72 feet across its opening and 9 feet deep at its center. The receiver should be placed at the focus of the parabolic dish. Where is the focus?

A) The focus will be at (0, 9) so the receiver should be placed 36 feet from the vertex.
B) The focus will be at (0, 36) so the receiver should be placed 9 feet from the vertex.
C) The focus will be at (36, 0) so the receiver should be placed 9 feet from the vertex.
D) The focus will be at (0, 36) so the receiver should be placed 72 feet from the vertex.