Evaluate the integral.
3x dx
A. - x cot 3x + ln 
+ C
B. 
x cot 3x - 
ln 
+ C
C. - 3x cot 3x + 9 ln 
+ C
D. - 
x cot 3x + 
ln 
+ C
Answer: D
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Solve the problem.A condominium association is holding an election for president of the board of directors. Each member ranks the candidates. The preference schedule below shows the results of the ballots with candidates Abbott (A), Blake (B), Cleary (C), and Downs (D).
Determine the winner using the plurality method.
A. Cleary B. Blake C. Abbott D. Downs
Divide and simplify.
A. z3
B. 
C. z13
D. 
Find the vertices and the foci of the given ellipse.
+ 
= 1
A. V: (-9, 0), (9, 0)
F: (-3, 0) and (3, 0)
B. V: (-3, 0), (3, 0);
F:(- 
, 0), (
, 0)
C. V: (0, -3), (0, 3);
F: (0, - 
), (0, 
)
D. V: (0, -4), (0, 4);
F: (0, -2) and (0, 2)
In economics, the most economical quantity Q of goods (TVs, dress, gallons of paint, etc.) for a store to order is given by Wilson's lot size formula 
, where K is the cost of placing the order, M is the number of items sold per week, and h is the weekly holding costs for each item (the cost of storage space, utilities, taxes, security, etc.). Calculate
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, 
, and
. Round your answer to two decimal places.
A. ?
B. 
C. ?
D. ?
E. ?