Question

is 3x3 matrix containing all the rows as zero is in reduced row echolon form.i.e
[0 0 0]
[0 0 0] is in reduced row echolon form

[0 0 0]

Answer 1

the icons stay on the screen even after the person logs out.

Answer 2

For it to be in RREF form, all leading coefficients must be 1....