Solve the system of equations.x1 - x2 + x3 = 8x1 + x2 + x3 = 6x1 + x2 - x3 = -12
A. (2, -1, 9)
B. (-2, -1, -9)
C. (2, -1, -9)
D. (-2, -1, 9)
Answer: D
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Find the sum.219.84 + 0.9997 + 45 + 6.34069 + 60.459
A. 332.73939 B. 332.63939 C. 332.63839 D. 331.63969
Solve the problem.The sales for a gaming console for various years are listed in the table below. 
Let s represent the sales (in billions of dollars) at t years since 1990. A reasonable model is 
According to the model, when were sales at a minimum? What were the sales in that year?
A. 1996; $180 million B. 1995; $166 million C. 1995; $172 million D. 1997; $170 million
Solve the problem.A theatre sells two types of tickets to their plays; children's tickets and adult tickets. For today's performance they have sold a total of 1456 tickets. Also, they have sold 80 more adult tickets than children's tickets. How many adult tickets have they sold?
A. 768 B. 753 C. 766 D. 773
Write decimal notation.
A. 18.4116 B. 22.116 C. 18.004116 D. 18.04116