answer true or false and give an explanation 21 If A is 2 x 3 matrix and A 0 9 6 2 and 4 i 1 then 4 6 A 1 A 0 1 Go to page 40 22 If A is a 5 x 3 matrix then null A 03 23 If A is a 3 5 matrix then null A 0