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OpenStudy (anonymous):
The reflecting dish of a parabolic microphone has a cross-section in the shape of a parabola. The microphone itself is placed on the focus of the parabola. If the parabola is 24 inches wide and 9 inches deep, how far from the vertex should the microphone be placed?
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OpenStudy (anonymous):
4py = x² 4p(9) = 144 p = 4 in
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