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. {(-1, -2)}
B. {(0, -2)}
C. {(1, -3)}
D. no solution; ?
Answer: C
Mathematics
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Multiply and, if possible, simplify.
? 
A. 18
B. 24
C. 12
D. 12
Mathematics
Find the domain of the rational expression. 
A. {x|x is a real number and x ? -3 and x ? -2} B. {x|x is a real number and x ? -3 and x ? -2 and x ? 2} C. {x|x is a real number and x ? 3 and x ? 2} D. {x|x is a real number and x ? 3 and x ? -2 and x ? 2}
Mathematics
Solve the equation.
= 
A. 
B. 
C. 
D. 
Mathematics
Evaluate the algebraic expression for the given value. If necessary, simplify your answer.
- 
; x = 5, y = 7
A. 32 B. 12 C. 4 D. 3
Mathematics