The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).x2 + y2 - 4x = 0
A. r = 4 cos ?
B. r cos2 ? = 4 sin ?
C. r sin2 ? = 4 cos ?
D. r = 4 sin ?
Answer: A
Mathematics
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Perform the indicated operation and write the answer in lowest terms.- 
- 
A. 
B. 
C. 
D. 
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A. 
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B. 
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C. 
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