Find the center (h, k) and radius r of the circle with the given equation. x2 + y2 + 2x - 14y + 50 = 81
A. (h, k) = (-1, 7); r = 9
B. (h, k) = (-7, 1); r = 81
C. (h, k) = (1, -7); r = 81
D. (h, k) = (7, -1); r = 9
Answer: A
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