Solve the problem.A field microphone used at a soccer game has a parabolic cross section and is 18 in. wide at the opening. The focus is 25 in. from the vertex. Find the depth of the microphone.
A. 0.81 in.
B. 12.96 in.
C. 0.36 in.
D. 3.24 in.
Answer: A
Mathematics
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