Find the center and radius of the circle with the given equation. x2 + 2x + 1 + (y - 9)2 = 81
A. Center (-1, 9), r = 9
B. Center (1, -9), r = 81
C. Center (9, -1), r = 9
D. Center (-9, 1), r = 81
Answer: A
Mathematics
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