Rewrite the equation in standard form. Find the center and radius of the circle.x2 + y2 - 4y - 77 = 0
A. x2 + (y - 2)2 = 81
center (0, 2), r = 9
B. x2 + (y + 2)2 = 81
center (0, -2), r = 9
C. x2 + (y - 2)2 = 81
center (0, -2), r = 9
D. (x - 2)2 + y2 = 81
center (2, 0), r = 9
Answer: A
Mathematics
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