Identify the solid.
A. cylinder
B. rectangular solid
C. sphere
D. cube
Answer: A
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Graph the function f(x) over the given interval. Partition the interval into 4 subintervals of equal length. Then add to your sketch the rectangles associated with the Riemann sum 
, using the indicated point in the kth subinterval for ck.f(x) = cos x + 3, [0, 2?], right-hand endpoint
A. 
B. 
C. 
D. 
As part of a statistics project, a 6th grade teacher brings to class a container with 300 red marbles and 500 white marbles which are thoroughly mixed. To figure out how many marbles in the container are red without actually counting them all, a student randomly draws 40 marbles from the container. Of the 40 marbles drawn, 16 are red.The sampling proportion is
A. 37
%.
B. 5%.
C. 
%
D. 
%.
E. none of these
Convert complex numbers to trigonometric form and then simplify the expression. Write the answer in standard form.
?
?
A. ?
B. ?
C. ?
D. ?
E. 
Divide. Express the quotient in lowest terms.
÷ 
A. 
B. 
C. 
D. 