Let W be the subspace spanned by 2 Find a basis for W and the dimension of W. (Note that the reduced row echelon form of (a) Basis: (b) Dimension: 0 3 6 0 0 Toon 3 [1-30 0 0 0 is 6 0 0 0 0 -1 1101 0010 2002 Problem 9. (6 points) Find the dimensions of the following linear spaces. (a) The space of all 6 x 6 matrices with trace zero. (b) P3 (c) The space of all upper triangular 3 x 3 matrices Note: You can earn partial credit on this problem. D