Express the statement as an equation involving the indicated variables.The surface area S of a sphere is 4 times ? times the square of the radius r.

A. S = 4?r
B. S = ?r2
C. S = 4?r2
D. S = 4? 

Answer: C

Mathematics

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A. 26, 28 B. 26, 24 C. 28, 30 D. 24, 22

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