(a) -2A + B = ⌈6 -2⌉ + ⌈0 4⌉ = ⌈6 2⌉
⌊0 -4⌋ ⌊-1 6⌋ ⌊-1 2⌋
(b) 4A - 3B = ⌈-12 4⌉ + ⌈0 12⌉ = ⌈-12 16⌉
⌊0 8⌋ ⌊3 -18⌋ ⌊3 -10⌋
(c) AT = ⌈-3 0⌉
⌊1 2⌋
(d) B - A = ⌈3 3⌉
⌊-1 4⌋
(B - A)t = ⌈3 -1⌉
⌊3 4⌋