Write the complex number in the form a + bi.
(cos 150° + i sin 150°)
A. - 
+ 
i
B. - 
+ 
i
C. - 
+ 
i
D. - 
+ 
i
Answer: B
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Solve the problem.A retired couple has $130,000 to invest to obtain annual income. They want some of it invested in safe Certificates of Deposit yielding 5%. The rest they want to invest in AA bonds yielding 12% per year. How much should they invest in each to realize exactly $12,100 per year?
A. $80,000 at 12% and $50,000 at 5% B. $90,000 at 12% and $40,000 at 5% C. $80,000 at 5% and $50,000 at 12% D. $70,000 at 5% and $60,000 at 12%
Solve the problem.Write an iterated triple integral in the order 
for the volume of the region in the first octant enclosed by the cylinder 
and the plane 
.
A. 
B. 
C. 
D. 
Find an equation for the ellipse described.Foci at (-1, 5) and (-1, -1); length of major axis is 10
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
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