For Exercise , perform the indicated operations if possible.

$A=\left[\begin{array}{ccc}4& 1& -3\\ 2& 4& 6\end{array}\right],B=\left[\begin{array}{cc}1& 9\\ 0& -1\\ 3& 5\end{array}\right],C=\left[\begin{array}{ccc}0& 1& -4\\ 2& -1& 8\end{array}\right]$

A+B=?

A+B=?