Find the center and radius of the sphere.x2 + y2 + z2 - 4x - 12y - 8z = 25
A. C(2, 6, 4), a = 9
B. C(-2, -6, -4), a = 81
C. C(2, 6, 4), a = 81
D. C(-2, -6, -4), a = 9
Answer: A
Mathematics
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