Use the Gauss-Jordan method to solve the system of equations.-2x + 8y - z = 45 x + 7y + 8z = 122 5x + y + z = 21
A. (-1, 7, 2)
B. (1, 7, 9)
C. (1, 9, 7)
D. No solution
Answer: B
Mathematics
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Determine whether (f(g(x)) = x and whether (g (f(x)) = x.f(x) = 
, g(x) = x
A. No, yes B. Yes, no C. Yes, yes D. No, no
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Divide.Divide using synthetic division: 
A. 3x + 4
B. x - 4
C. 3x - 4
D. 3x - 4 + 
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Solve and graph. Write the solution in interval notation.| x | ? 8
A. (-?, -8]
B. (-?, 8]
C. [-8, 8]
D. (-?, -8] ? [8, ?)
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Find the decimal form for the rational number. If it repeats, then so indicate with a bar.
A. 0.6
B. 1.4
C. 0.4
D. 0.
Mathematics