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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Solve the problem.Jarod operates a small part-time business from his home. The accompanying graph shows the daily profit or loss for his business. How much more did the company earn on Friday than on Monday? 

A. $44 B. $65 C. $9 D. $12

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Match the graph to one of the polar equations. 

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f (x) = cos (tan (2x))

Differentiate.

Mathematics