A reflector for a satellite dish is parabolic in cross section, with the receiver at the focus F. The reflector is 1 ft deep and 30 ft wide from rim to rim (see the figure). How far is the receiver from the vertex of the parabolic reflector? 
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Round to the nearest foot, if necessary.
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A. 59 ft
B. 51 ft
C. 56 ft
D. 53 ft
E. 52 ft
Answer: C
Mathematics
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