(5 points) Let
A = \begin{pmatrix} 7 & 7 \\ 8 & 6 \end{pmatrix}, B = \begin{pmatrix} -7 & 9 \\ -6 & 6 \end{pmatrix}, C = \begin{pmatrix} 7 & 6 \\ 9 & 5 \end{pmatrix}
Then
where a_{11} = \boxed{\qquad}, a_{12} = \boxed{\qquad}, a_{21} = \boxed{\qquad}, a_{22} = \boxed{\qquad}, and
A + B^T = \begin{pmatrix} a_{11} & a_{12} \\ a_{21} & a_{22} \end{pmatrix}
where c_{11} = \boxed{\qquad}, c_{12} = \boxed{\qquad}, c_{21} = \boxed{\qquad}, c_{22} = \boxed{\qquad}
A - B + C^T = \begin{pmatrix} c_{11} & c_{12} \\ c_{21} & c_{22} \end{pmatrix}
