Rationalize the denominator.
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Perform the indicated operation(s). Simplify if possible.
+ 7
A. 
B. 
C. 4 + 7x
D. 4x + 7
Mathematics
Find the product.(-9a + 5b)(-8a + 3b)
A. 72a2 - 67ab + 15b2 B. 72a2 + 67ab + 15b2 C. 72a2 + 13ab + 15b2 D. 72a2 + 15b2
Mathematics
In ?ABC, if a = 10, b = 11 and c =12, find ?A, ?B and ?C . Round to the nearest tenth.
Mathematics
Solve the problem.The concentration C (arbitrary units) of a certain drug in a patient's bloodstream can be modeled using 
where t is the number of hours since a 500 milligram oral dose was administered. Using the TABLE feature of a graphing utility, find the time at which the concentration of the drug is greatest. Round to the nearest tenth of an hour.
A. 5.3 hours B. 3.8 hours C. 4.6 hours D. 6.1 hours
Mathematics