Complete parts A-F for matrix A, and vector b given below [3 -9 12 -9 6 15 A = 3 -7 8 -5 8 9,b= 9 0 3 -664-5 (a) Find the reduced row echelon form of the augmented matrix Ax=b by hand and write the solution as a linear combination of vectors. (b) Identify the null space of A? (c) What is the dimension of the null space? (d) Find a matrix, R, with dimensions 6 x 3 such that AR = 0(Note: Matrix R cannot be the 0 matrix.)

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