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OpenStudy (anonymous):
helpp... derive the equation of a parabola with a focus at (0, -4) and a directrix at y=4 answr choices: A: f(x) = -16x^2 B: f(x) = 16x^2 C: f(x) = -1/16x^2 D = f(x) = 1/16x^2
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OpenStudy (anonymous):
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