Question: ' The reflector St a ashlight is in the shape of a parabolic surface. The casting has a diameter of 6 inches and a depth

' The reflector St a ashlight is in the shape of a parabolic surface. The casting has a diameter of 6 inches and a depth of 3 inches. How far from the vertex should the light bulb be placed? a The light bulb should be placed E inch from the vertex. (Simplify your answer.)

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