The polar equation of the graph is either r = a + b cos ? or r = a + b sin ?, a > 0, b > 0. Match the graph to one of the equations. 
A. r = 2 + 4 sin ?
B. r = 2 + 4 cos ?
C. r = 4 + 2 cos ?
D. r = 4 + 2 sin ?
Answer: D
Mathematics
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B. 
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? = 10,000 CDsIn which year will the greatest number of CDs be sold?
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What will be an ideal response?
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