#### Answer

Part A:
Since A and B are not the same dimensions, A + B is undefined.
Part B:
Since A and B are not the same dimensions, A - B is undefined.
Part C:
$\begin{bmatrix}
18 & 0 & 9\\
-3 & -12 & 0\\
\end{bmatrix}$
Part D:
Since A and B are not the same dimensions, 3A - 2B is undefined.

#### Work Step by Step

The dimensions of A are (2 x 3).
The dimensions of B are (2 x 2).
Part A:
Since A and B are not the same dimensions, A + B is undefined.
Part B:
Since A and B are not the same dimensions, A - B is undefined.
Part C:
$\begin{bmatrix}
3(6) & 3(0) & 3(3)\\
3(-1) & 3(-4) & 3(0)\\
\end{bmatrix}$ = $\begin{bmatrix}
18 & 0 & 9\\
-3 & -12 & 0\\
\end{bmatrix}$
Part D:
Since A and B are not the same dimensions, 3A - 2B is undefined.