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OpenStudy (anonymous):
A parabolic microphone has a cross-section in the shape of a parabola. The microphone is placed at the focus of the parabola. If the parabola is 20 inches wide and 5 inches deep, how far from the vertex should the microphone be placed? 4 inches 5 inches 8 inches 10 inches
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OpenStudy (anonymous):
@ajprincess
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