Provide an appropriate answer.Suppose that x2 + y2 = r2 and x = r cos ?, as in polar coordinates. Find 
r.
A. 
r= -r sin ?
B. 
r= r(cos ? - sin ?)
C. 
r= 0
D. 
r= r cos ?
Answer: D
Mathematics
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Solve the problem. Round your answer to two decimal places.Scores on a test are normally distributed with a mean of 118 and a standard deviation of 15. What is the exam score corresponding to a standard score of 1.92?
A. 118.13 B. 89.2 C. 146.8 D. None of the above
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Express the area of the region bounded by the given line(s) and/or curve(s) as an iterated double integral.The lines 
, 
, and 
A. 
B. 
C. 
D. 
Mathematics
Factor by grouping.24bx - 12by - 16kx + 8ky
A. 4(3b - 2k)(2x + y) B. 4(3b + 2k)(2x + y) C. 4(3b + 2k)(2x - y) D. 4(3b - 2k)(2x - y)
Mathematics
Determine whether the pair of lines is parallel, perpendicular, or neither.12x + 4y = 1621x + 7y = 31
A. Parallel B. Perpendicular C. Neither
Mathematics