Find an equivalent expression.cot 
A. -tan x
B. sec x
C. tan x
D. - 
Answer: A
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Solve the variation problem.The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 18 minutes requires 10.8 gallons of water. Find the amount of water used in a shower lasting 7 minutes.
A. 126 gallons B. 3.6 gallons C. 4.8 gallons D. 4.2 gallons
Determine if the given set of whole numbers is closed under multiplication.{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, . . . } (that is, the whole numbers except for 12)
A. Not closed B. Closed
Graph the function.y = 4 csc 
A. 
B. 
C. 
D. 
For the given rectangular equation, write an equivalent polar equation.xy = 1
A. 2r sin ? cos ? = 1 B. r sin 2? = 2 C. 2r2sin ? cos ? = 1 D. r2sin 2? = 2