Several logs are stored in a pile with 20 logs on the bottom layer, 19 on the second layer, 18 on the third layer, and so on. If the top layer has one log, how many logs are in the pile?
?
A. 200
B. 190
C. 210
D. 209
E. none of the above
Answer: C
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Find the quadratic approximation of f at x = 0.f(x) = 
A. Q(x) = 1 + 2x
B. Q(x) = 
C. Q(x) = 2x
D. Q(x) = 1 + 
As part of a statistics project, a 6th grade teacher brings to class a container with 200 red marbles and 800 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 150 marbles from the container. Of the 150 marbles drawn, 33 are red.The target population consists of
A. the 200 red marbles in the container. B. the 1000 marbles in the container. C. the 33 marbles drawn by the student. D. the 150 marbles drawn by the student. E. none of these
Find the foci of the ellipse whose equation is given.
+ 
= 1
A. foci at (3, -2 - 3
) and (3, -2 + 3
)
B. foci at (-2, -2 - 3
) and (-2, -2 + 3
)
C. foci at (2, -2 - 3
) and (2, -2 + 3
)
D. foci at (-2, 2 - 3
) and (-2, 2 + 3
)
Simplify.
A. 
B. 
C. 
D. 