Rationalize the denominator and simplify. Assume that all variables represent positive real numbers.
A. 
B. 
C. 
D. 
Answer: A
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Solve the problem.Find the moment of inertia about the z-axis of a thick-walled right circular cylinder bounded on the inside by the cylinder r = 1, on the outside by the cylinder r = 4, and on the top and bottom by the planes z = 6 and z = 10.
A. 255? B. 510? C. 1020? D. 512?
Solve the problem.Suppose your job is to take phone orders for computer parts. Use the table below to answer the following questions. Write the correct part number that matches what you hear the customer say on the phone. 
"Can you rush me the 4-thousandth centimeter size?"
A. G B. I C. A D. B
Solve the problem.Stan and Ron's hobby is building birdhouses. The number of wren houses cannot exceed 2 times the number of martin houses. They cannot make more than 50 wren houses or more than 70 martin houses. The total production cannot exceed 75. The profit on a wren house is $6.60 and the profit on a martin house is $8.40. Find the maximum profit.
A. $585.00 B. $1512.00 C. $540.00 D. $621.00
Simplify the exponential expression.
A. -4x4y8 B. -4x3y4 C. -4x3y7 D. x4y8