Solve.The area of a circle varies directly as the square of the radius of the circle. If a circle with a radius of 5 inches has an area of 78.5 square inches, what is the area of a circle with a radius of 15 inches?
A. 706.5 in.2
B. 94.2 in.2
C. 47.1 in.2
D. 708.9 in.2
Answer: A
Mathematics
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A. $44 B. $65 C. $9 D. $12
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Match the graph to one of the polar equations. 
A. r = 3 + sin ? B. r = 3 + cos ? C. r = 6 sin ? D. r = 6 cos ?
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f (x) = cos (tan (2x))
Differentiate.
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