Find the center and radius of the sphere.x2 + y2 + z2 - 10x - 8y + 10z = -2
A. C(5, 4, 5), a = 8
B. C(5, 4, -5), a = 8
C. C(5, 4, -5), a = 64
D. C(-5, -4, 5), a = 8
Answer: B
Mathematics
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A. 
B. 
C. 
D. 
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Solve the problem.Suppose a life insurance policy costs $16 for the first unit of coverage and then $4 for each additional unit of coverage. Let C(x) be the cost for insurance of x units of coverage. What will 10 units of coverage cost?
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