Mathematics, 04.07.2019 08:30 ohgeezy

Which is the directrix of a parabola with equation x^2=4y? ? a. y=1 b. x=-1 c. y=-1 d. x=1

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Which is the directrix of a parabola with equation x^2=4y? ? a. y=1 b. x=-1 c. y=-1 d. x=1...