I dont know how to deal with this kind of question

Suppose that 21 10 4 10 NON In the following questions you may use the fact that the matrix B is row-equivalent to A, where 0 1 -2 0 B= 0 0 0 0 (a) Find: the rank of A 3 the dimension of the nullspace of A 2 (b) Find a basis for the nullspace of A. Enter each vector in the form [x1, x2, ...]; and enter your answer as a comma-separated list: for example if your answer is the se AWN 10 20 30 40 50 then type "[1, 2, 3, 4, 5], [10, 20, 30, 40, 50]" WITHOUT the quote marks. (c) Find a basis for the column space of A. As in part (b), enter each vector in the form [x1, x2, ...]; and enter your answer as a comma-separated list. (d) Let the columns of A be denoted by a1, a2, a3, a4, and as. Which of the following sets is / are linearly independent? Select all that apply. Note: three submissions allowed for this part. {a1, a2, a3) {a1, a2, a4} O {a1, a3, a5) None of the above