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if the center of a parabola is at (0,0), the focus is at (0,4) and the...

if the center of a parabola is at (0,0), the focus is at (0,4) and the directrix is at y=-4. What is the value of p? What is the meaning of p? If point Q is on the parabola at (k,4) what is the value of k? And what is the focal diameter length?

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