Solve the problem.One pump can drain a pool in 10 minutes. When a second pump is also used, the pool only takes 9 minutes to drain. How long would it take the second pump to drain the pool if it were the only pump in use?
A. 
minute
B. 4
minutes
C. 90 minutes
D. 89 minutes
Answer: C
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Solve the problem.There are 9 members on a baseball team. At the end of the game, each member of the team shakes hands with each member of the opposing team. How many handshakes occur?
A. 9 B. 81 C. 162 D. 40.5
Solve the system of equations (only real solutions) by the elimination method. Check your solutions.
A. {(1, -2), (-1, 2)} B. {(1, 1), (-1, -1), (1, -2), (-1, 2)} C. {(1, 0), (-1, 0), (1, -2), (-1, 2)} D. {(1, 0), (1, 1)}
Solve the logarithmic equation. Be sure to reject any value that is not in the domain of the original logarithmic expressions. Give the exact answer.log4(x + 2) + log4(x - 4) = 2
A. {-4} B. {6} C. {7} D. {6, -4}
State whether the graph of each inequality includes its corresponding boundary line. x - y ? 1
A. Yes B. No