Find the center (h, k) and radius r of the circle with the given equation. x2 + 8x + 16 + y2 + 18y + 81 = 36
A. (h, k) = (9, 4); r = 36
B. (h, k) = (4, 9); r = 36
C. (h, k) = (-9, -4); r = 6
D. (h, k) = (-4, -9); r = 6
Answer: D
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