The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).x2 + y2 - 4x = 0
A. r sin2 ? = 4 cos ?
B. r cos2 ? = 4 sin ?
C. r = 4 sin ?
D. r = 4 cos ?
Answer: D
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Graph.48x2 + 27y2 = 432
A. 
B. 
C. 
D. 
Find the first 4 terms of the recursively defined sequence.a1 = 6, an + 1 = 2 ? an
A. 6, 12, 24, 48 B. 0, 4, 24, 28 C. 12, 24, 48, 96 D. 6, 24, 28, 32
Solve for the specified variable. Assume that all other variables are nonzero.rm = t2 - mt; for t
A. t = 
B. t = 
C. t = 
D. t = 
Solve the problem.Two vertical poles of lengths 20 feet and 32 feet are situated on level ground 50 feet apart, as shown in the figure below. A piece of wire is to be strung from the top of the 20-ft pole, to a stake in the ground, to the top of the 32-ft pole. At what distance from the 20-foot pole should the stake be located to minimize the amount of wire used? Round your answer to the nearest tenth of a foot.20 ft
32 ft? 50 ft
A. 19.5 ft B. 23.3 ft C. 15.5 ft D. 17.2 ft