Simplify.
A. 4.264x2y4
B. 9x4y2
C. 3x2y4
D. not a real number
Answer: C
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Solve the problem.A reservation clerk worked 10.35 hours one day. She spent twice as much time entering new reservations as she did verifying old ones and one and a half as much time calling to confirm reservations as verifying old ones. How much time did she spend entering new reservations?
A. 4.6 hr B. 3.45 hr C. 2.3 hr D. 9.2 hr
Find the length of the third side of the right triangle. Where appropriate, give both an exact answer and an approximation to three decimal places. 
A. 
? 9.899
B. 7
C. 14
D. 
? 12.124
Use the fundamental identities to simplify the expression.1 - cos2 ?
A. sin ? B. sin2 ? C. tan2 ? D. - sin2 ?
Perform the indicated operation. Assume that all variables are nonnegative.(
)2
A. 
B. 47
C. 
D. 94