i need solution

webwork.uncc.edu [-6 -1 4] (a) Find the reduced row echelon form of the matrix B. rref ( B) = (b) How many pivot columns does B have? (c) Do the vectors in the set -6 - - ]} span R' ? Be sure you can explain and justify your answer. choose (d) Are the vectors in the set-old- } linearly independent? Be sure you can explain and justify your answer. Done choose the vectors span R^3 the vectors do not span R^3