Solve the system. 7x + 4y - z = 64 x - 3y - 8z = -13 9x + y + z = 68
A. ?
B. {(7, 4, 1)}
C. {(-7, 4, 14)}
D. {(7, 1, 4)}
Answer: B
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Evaluate the expression using the given values.x + 12y
x = 1, y = -1
A. 11 B. -11 C. 13 D. 0
Solve the problem. Round approximations to the nearest cent.The five sales people at Southwest Appliances earned commissions last year of $17,000, $29,000, $48,000, $20,000, and $23,000. Find the mean commission.
A. $28,770 B. $26,030 C. $30,140 D. $27,400
Clear fractions then solve by substitution. 
x + y = 
+ 2y 4x - 4 + 
= -3 + 5x
A. ?
B. 
C. 
D. 
Use arithmetic operation signs such as +, -, ? and ÷ between the values to produce the desired result. You may use parentheses as well.34 __ 2 __ 138 __ 3 = 126
A. 34 + 2 ? 138 ÷ 3 = 126 B. 34 + 2 + (138 ÷ 3) = 126 C. (34 ? 2 + 138) ÷ 3 = 126 D. 34 ? 2 + 138 ÷ 3 = 126