Translate the sentence into a mathematical equation. Be sure to identify the meaning of all symbols.The surface area of a sphere is 4? times the square of the radius.
A. If S represents the surface area and r the radius, then 4?S =r2.
B. If S represents the surface area and r the radius, then S = 4?r.
C. If S represents the surface area and r the radius, then S = 4?r2.
D. If S represents the surface area and r the radius, then S = ?r2.
Answer: C
Mathematics
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A. 
B. 
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D. 4
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A. {x|x ? 6} B. all real numbers C. {x|x ? -6} D. {x|x ? 0}
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Solve the system by substitution. x + 2y = 14-2x + 3y = 21
A. (1, 6) B. (0, 7) C. (-7, 0) D. No solution
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A. 3.86 B. 3.845 C. 3.85 D. 3.84
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