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Which of the following parabolas opens up?
• A. Directrix: y = -2; focus: (25, - 5)
• B. Directrix: y = 2; focus: (4, 5)
C. Directrix: y = 2; focus: (-1, -3)
• D. Directrix: y = -2; focus: (3, -3)

Sagot :

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