Chapter 4, Problem 3RE

For Exercises 1–10, let

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

Determine whether each expression is defined. If it is, evaluate it.

$2A^T+C$