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The reflecting dish of a parabolic microphone has a cross-section in the shape of a...

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Algebra

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The reflecting dish of a parabolic microphone has a cross-section in the shape of a parabola. Themicrophone itself is placed on the focus of the parabola. If the parabola is 24 inches wide and 9 inchesdeep, how far from the vertex should the microphone be placed?6 inches8 inches16 inches4 inches

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