Find the domain of the rational function.r(x) = 
A. All real numbers except -8 and 2.
B. All real numbers except -2 and 8.
C. All real numbers except -6 and 6.
D. All real numbers.
Answer: B
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Evaluate x2, -x2, and (-x)2 for the following value of x.-1
A. x2 = 1; -x2 = 1; (-x)2 = -1 B. x2 = 1; -x2 = -1; (-x)2 = 1
Find the domain and the range for the function.
A. D: [2, ?), R: [0, ?) B. D: [-2, ?), R: (-?, 0] C. D: [0, ?), R: [2, ?) D. D: [0, ?), R: [0, ?)
Solve the problem.Find the centroid of the first-octant portion of a solid ball of radius 1 centered at the origin.
A. (
, 
, 
) = 
B. (
, 
, 
) = 
C. (
, 
, 
) = 
D. (
, 
, 
) = 
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 sample consists of
A. the 33 red marbles drawn by the student. B. the 1000 marbles in the container. C. the 200 red marbles in the container. D. the 150 marbles drawn by the student. E. none of these