Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. 2x + y + 2z - 4w = 10x + 3y + 2z - 11w = 173x + y + 7z - 21w = 0
A. {(3w + 5, 6w + 6, -4w - 3, w)}
B. {(w + 5, 8w + 4, -3w - 2, w)}
C. {(-3w + 5, 2w + 6, 4w - 3, w)}
D. {(w - 5, 8w - 4, -3w + 2, w)}
Answer: C
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Reduce 18 feet per second to miles per hour.
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