How many free variables does each augmented matrix have? a. Choose b. Choose c. Choose ✓ d. Choose V 1 0 0 0 -2 1 -4 0 0 1 0 0 0 1 0 0 0 0 0 0 0 1 0 0 -3 0 -10 0 0 0 -9 0 1 72 -9 [3] 0 0 0 -10 0

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A:

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A:

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A:

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