Useful MATLAB Commands: rref (A) Returns reduced row echelon form matrix obtained from A. rank (A) Returns the rank of A. null (A) Returns one or more columns of numbers. Each column is a basis vector for the nullspace of A. Find the reduced row echelon form (RREF) for the matrix A = [1 0 3/2 5 4 -1 2 -1 -2 -5 -2 -3 4 1 -4 -6 5 1 1 4 1 1 3 2 -5 4 3 0 -4 0 0 5 3 0 -7 3]. Use the RREF to determine a basis for the solution space of the system Ax = 0. From this basis, determine the dimension of the nullspace (or kernel) of A