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The reflector of a flashlight is in the shape of a parabolic surface. The casting has a diameter of 8 inches and a depth of

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The reflector of a flashlight is in the shape of a parabolic surface. The casting has a diameter of 8 inches and a depth of 8 inches. How far from the vertex should the light bulb be placed? The light bulb should be placed inch from the vertex. (Simplify your answer.)

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