Solve the system of equations.
A. x = 0, y = 1, z = 0; (0, 1, 0)
B. x = 0, y = 1, z = -1; (0, 1, -1)
C. x = 0, y = 0, z = 1; (0, 0, 1)
D. inconsistent
Answer: A
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A. 
B. 
C. 
D. 
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B. 
C. 
D. 
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Find the difference in Joel's net income between week 3 and week 4.
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