Matrix A order is 4x8.
Matrix B order is 4x16.
AB cannot result because an (m x n) can only be multiplied by an (n x p) matrix and orders don't match the requirements.
BA has the same negative result.
Answer:

You don't technically need the ( ) around the 2n, but I included them to avoid confusion.
Answer:
2
Step-by-step explanation:
I dont know for sure though...
70%
12+27+91 = 130
91/130 = .7
.7x100 = 70%
___
.700
7.00
70.0
Answer is 70%