Exercises 9-12 display a matrix a and an echelon form of a. find bases for col a and nul a, and then state the dimensions of these subspaces

A = [ 1 2 -4 3 3]
[ 5 10 -9 -7 8]
[ 4 8 -9 -2 7]
[ -2 -4 5 0 -6]

[ 1 2 -4 3 3]
~ [ 0 0 1 -2 0]
[ 0 0 0 0 -5]
[ 0 0 0 0 0]