Find an equivalent equation in polar coordinates.x2 - y2 = 4
A. r cos 2? = 4
B. cos2? - sin2? = 4
C. cos2? - sin2? = 4r
D. r2cos 2? = 4
Answer: D
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The problem tells by what factor and direction the graph of the given function is to be stretched or compressed. Give an equation for the stretched or compressed graph.y = x2 + 3
stretched horizontally by a factor of 3
A. y = 
+ 3
B. y = 9x2 + 3
C. y = 
+ 3
D. y = 3x2 + 9
Decide whether or not the ordered pair is a solution of the system.(1, -5)4x = -1 - y2x = -18 - 4y
A. No B. Yes
Solve.The number of centimeters, d, that a spring is compressed from its natural, uncompressed position is given by the formula 
where W is the number of joules of work done to move the spring and k is the spring constant. Solve this equation for W. Use the result to determine the work needed to move a spring 9 centimeters if it has a spring constant of 0.4.
A. W = 
B. W = 
C. W = 2d2k
D. W = 
Use a combination of rules for exponents to simplify. Write answers with only positive exponents. Assume that all variables represent nonzero real numbers.
2
A. 
B. 
C. 
D. 