The reduced row echelon form of the augmented matrix of a system of equations is given. Find the solutions of the system. 
A. No solution
B. (13,- 9, 4, 0)
C. (13 + 3w, -9, 4 - 2w, w) for any real number w
D. (13 - 3w, -9, 4 + 2w, w) for any real number w
Answer: D
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A. 73 newspapers B. 70 newspapers C. 71 newspapers D. 72 newspapers
Compute the commission. Round to the nearest cent, if necessary.
A. $5.66 B. $14.41 C. $14.96 D. $16.81
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where 
(Round to the nearest decibel.)
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