Express the product as a sum containing only sines or cosines.sin(2?) sin(4?)
A. sin2(8?2)
B. 
[cos(6?) - sin(2?)]
C. 
[- cos(2?) - cos(6?)]
D. 
[cos(2?) - cos(6?)]
Answer: D
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Solve the problem.Suppose a cost-benefit model is given by 
where C is the cost in thousands of dollars for removing p percent of a given pollutant. Find C(90) to the nearest dollar and interpret it.
A. $52,200; It will cost $52,200 to remove 90% of the pollutant. B. $5800; It will cost $5800 to remove 0.90% of the pollutant. C. $5220; It will cost $5220 to remove 0.90% of the pollutant. D. $9000; It will cost $9000 to remove 90% of the pollutant.
Use Bayes' rule to find the indicated probability.The incidence of a certain disease on the island of Tukow is 4%. A new test has been developed to diagnose the disease. Using this test, 91% of those who have the disease test positive while 4% of those who do not have the disease test positive (false positive). If a person tests positive, what is the probability that he or she actually has the disease?
A. 0.438 B. 0.487 C. 0.91 D. 0.856
Solve the problem.The human resources director of a small company interviewed nine people for an entry-level position. Two were rated as highly qualified, five were rated as qualified, and two were rated as unqualified. In how many different ways could the ratings be assigned?
A. 126 B. 1680 C. 280 D. 756 E. none of these
Find the limit.
A. -? B. 1 C. ? D. -8