Find an equation of the parabola described.Focus at (-3, 0); directrix the line x = 3

A. y2 = 12x
B. y2 = -12x
C. y2 = -3x
D. x2 = -12y


Answer: B

Mathematics

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A. Yes B. No

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A. ?
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C. ?
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Write the standard form of the equation of the circle. 

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