The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).x2 + y2 - 4x = 0
A. r cos2 ? = 4 sin ?
B. r sin2 ? = 4 cos ?
C. r = 4 sin ?
D. r = 4 cos ?
Answer: D
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For the given function value determine the quadrants in which the terminal side of the angle can lie.cos ? = -0.4
A. I, IV B. II, III C. I, III D. II, IV
Solve the system by the addition method.x2 - 3y2 - 1 = 04x2 + 3y2 - 19 = 0
A. {(-1, 2), (1, -2)} B. {(2, 1), (-2, -1)} C. {(2, 1), (2, -1), (-2, 1), (-2, -1)} D. {(1, 2), (-1, 2), (1, -2), (-1, -2)}
Make a preference table for the given voting situation.Eight voters are asked to rank 3 brands of automobiles: A, B, and C. The eight voters turn in the following ballots showing their preferences in order: 
Make a preference table for these ballots.
A. 
B. 
C. 
D. 
Name the quadrant in which the angle ? lies.sin ? > 0, cos ? < 0
A. I B. II C. III D. IV