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Find an Equation of the Parabola Described x2=84yx ^ { 2 } = 84 y

Question 86

Multiple Choice

Find an equation of the parabola described.
-Focus at (0, 21) ; directrix the line y = -21 A) x2=84yx ^ { 2 } = 84 y
B) y2=84xy ^ { 2 } = 84 x
C) y2=21xy ^ { 2 } = 21 x
D) x2=−84yx ^ { 2 } = - 84 y

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