Solve the system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. {(6, 18)}
B. no solution; ?
C. 
D. {(5, 3)}
Answer: B
Mathematics
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A. MCXCIX B. IXM C. CMXCIX D. IM
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Solve the problem.Trader Tower stands at 2890 feet high. Exchange Emporium is 884 feet tall. How much taller is Trader Tower than Exchange Emporium?
A. -2006 feet B. -3774 feet C. 3774 feet D. 2006 feet
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Decide whether or not the set is closed under addition.{n ? N: n ? 27}
A. Closed B. Not closed
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