Solve the system by the substitution method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. {(-1, 0)}
B. no solution; ?
C. {(-1, 1)}
D. {(-2, 1)}
Answer: A
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Solve the problem.Find the average distance from a point 
in the region bounded by 
to the origin.
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 method used in this example is called
A. quota sampling. B. simple random sampling. C. random sampling, but not simple random sampling. D. stratified sampling. E. none of these
Identify the figure and name it using the labels shown.
A. ray AF, or 
B. ray FA, or 
C. line FA, or 
D. line segment FA, or 
Remove a dominated strategy if one exists in the game. 
A.
B.
C.
D. no dominated rows or columns