A Satellite Dish Measures 30 Feet Across Its Opening and 13

Multiple Choice

A satellite dish measures 30 feet across its opening and 13 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, 13) so the receiver should be placed 15 feet from the vertex.
B) The focus will be at (0, 15) so the receiver should be placed 13 feet from the vertex.
C) The focus will be at (15, 0) so the receiver should be placed 13 feet from the vertex.
D) The focus will be at (0, 15) so the receiver should be placed 30 feet from the vertex.