Write a general formula to describe the variation.The surface area S of a right circular cone varies directly as the radius r times the square root of the sum of the squares of the base radius r and the height h. The constant of proportionality is ?.
A. S = ?r
B. S = ?r
C. S = ?r
D. S = ?
Answer: A
Mathematics
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For the graph of a circular function y = f(x), determine whether f(-x) = f(x) or f(-x) = -f(x) is true.
A. f(-x) = -f(x) B. f(-x) = f(x)
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A. - 
B. 
C. 1
D. 0
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A. 
B. 
C. 
D. 
E. 
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