Perform the Following Matrix Operations If Possible $\left[\begin{array}{rr}3 & -1 \\ 5 & 2\end{array}\right]\left[\begin{array}{rrr}1 & -4 & 1 \\ 3 & 2 & -2\end{array}\right]$

Perform the following matrix operations if possible.
(a) $\left[\begin{array}{rr}3 & -1 \\ 5 & 2\end{array}\right]\left[\begin{array}{rrr}1 & -4 & 1 \\ 3 & 2 & -2\end{array}\right]$
(b) $\left[\begin{array}{rrr}2 & -2 & 6 \\ 1 & 0 & -7\end{array}\right]+3\left[\begin{array}{rrr}-1 & 1 & -2 \\ 1 & 3 & 4\end{array}\right]$
(c) $\left[\begin{array}{rrr}3 & -4 & 5 \\ 7 & 10 & -4\end{array}\right]\left[\begin{array}{rrr}5 & 2 & -9 \\ 0 & 1 & 5\end{array}\right]$