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A searchlight is shaped like a paraboloid of revolution. If the light source is located 4 feet from the base along the axis of K

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A searchlight is shaped like a paraboloid of revolution. If the light source is located 4 feet from the base along the axis of K symmetry and the opening is 20 feet across, how deep should the searchlight be? The searchlight should be feet deep. (Type an exact answer in simplified form.) ip

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