Solve the problem.A lens can be described as the volume generated by rotating the first quadrant area under the curve 
about the y-axis (measurements in cm). Find its centroid.
A. 0.833 cm above the center of the base
B. 1.25 cm above the center of the base
C. 1.67 cm above the center of the base
D. 3.33 cm above the center of the base
Answer: C
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Find the volume of the described solid.The solid lies between planes perpendicular to the x-axis at x = -2 and x = 2. The cross sections perpendicular to the x-axis are circles whose diameters stretch from the curve 
to the curve 
A. 
?2
B. 25?2
C. 25?
D. 
?2
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.Suppose that the student is given the N-value. What is a reasonable estimate for the number of red marbles in the container?
A. 183 B. 150 C. 33 D. 220 E. none of these
Decide whether or not the points are the vertices of a right triangle.(6, 12), (8, 16), (10, 15)
A. No B. Yes
Graph the ellipse.
+ 
= 1
A. 
B. 