Write one or more inequalities that describe the set of points.The closed region bounded by the spheres of radius 2 and 6, both centered at the origin, and the planes 
and 
A. 4 ? x2 + y2 + z2 ? 36 and 1 ? x ? 3
B. 2 < x2 + y2 + z2 < 6 and x = 1 and x = 3
C. 2 ? x2 + y2 + z2 ? 6 and x = 1 and x = 3
D. 4 < x2 + y2 + z2 < 36 and 1 < x < 3
Answer: A
Mathematics
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