Find a set of columns that fo11n a basis for the column space of each of the following matrices. Give the rank of each matrix. Also find a basis for the null space of each matrix. a) [-3 6 5 -10]
b) [2 1 1 1 2 1 7 5 4]
c) [ 1 1 0 0 1 1 0 0 1 1 0 1 1 0 1 0 0 1 1 1 1 1 0 0 1]
d) [1 1 1 0 1 0 1 0 1 0 2 1 2 -1 2 -1 1 -1 2 -1 1 2 1 1 1]