Write the system of linear equations represented by the augmented matrix. Then use back-substitution to solve. (Use variables x, y, and z.)
A. x = 35, y = -3, z = 1
B. x = 4, y = 1, z = 5
C. x = 1, y = -4, z = -5
D. x = 1, y = 4, z = 5
E. x = -4, y = 5, z = -1
Answer: D
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A. converges; - 
B. converges; 
C. converges;1
D. diverges
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A. 0.015 B. 0.020 C. 0.031 D. 0.026
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A. 
B. 
C. 
D. 
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Find the ratio of pollutant D to pollutant B.
A. 
B. 
C. 
D. 