Problem 4. For each matrix, (i) find n such that the columns of the matrix are vectors in R", (ii) find the reduced row echelon form of each matrix, (iii) circle each pivot column, (iv) determine if the columns of the matrix form a basis for the space in (i). (b) 0 0 0 0 1 2 0 6 -9 0 4 -2 8 4 4

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