Use half-angle identities to find the exact value of the expression.sin 
A. 
B. 
C. 
D. 
Answer: D
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Identify which of these types of sampling is used: simple random, stratified, systematic, or convenience.A researcher interviews 19 work colleagues who work in his building.
A. Stratified B. Systematic C. Simple random D. Convenience
Find the center of mass of a thin plate of constant density covering the given region.The region bounded by y = x4, x = 2, and the x-axis
A. 
= 
, 
= 
B. 
= 
, 
= 
C. 
= 
, 
= 
D. 
= 
, 
= 
Graph the function.y = -tan (x + ?)
A. 
B. 
C. 
D. 
Solve the problem.Cindy will require $14,000 in 5 years to return to college to get an MBA degree. How much money should she ask her parents for now so that, if she invests it at 
compounded continuously, she will have enough for school? (Round your answer to the nearest dollar.)
A. $5692 B. $21,956 C. $9099 D. $8927