Solve the problem.A field microphone used at a soccer game has a parabolic cross section and is 16 in. wide at the opening. The focus is 4 in. from the vertex. Find the depth of the microphone.
A. 4.00 in.
B. 1.78 in.
C. 16.00 in.
D. 64.00 in.
Answer: A
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