The filament of a lightbulb is a thin wire that glows when electricity passes through it.  The filament of a car headlight is at the focus of a parabolic reflector, which sends light out in a straight beam.  Given that the filament is 1.5 inches from the vertex, and the reflector is 7 inches wide, which of the following is the equation of the cross section of the reflector and its depth

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