Solve the system of equations. x1 + x2 + x3 = 7 x1 - x2 + 2x3 = 75x1 + x2 + x3 = 11
A. (1, 4, 2)
B. (4, 2, 1)
C. (4, 1, 2)
D. (1, 2, 4)
Answer: D
Mathematics
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A. 80% B. 20% C. 1% D. 8%
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Use a graphing calculator to find the sum.
Round your answer to three decimal places.
A. 0.917 B. 1.100 C. 0.091 D. 0.063
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Evaluate the iterated integral 
by switching the order of integration. Round your answer to three decimal places.
?
A. 0.253 B. 0.273 C. 40.253 D. 1.253 E. 2.253
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Solve the inequality and graph the solution set.|z - 7| ? 0
A. No solution
B. 7 ? z ? -7 ; [7, -7]
C. All real numbers ; (-?, ?)
D. z ? 7 ; [7, ?)
Mathematics