Problems from Sum of matrices

Add up the matrices $(\begin{array}{ccc} 3 & 6 & 7 \\ 0 & 2 & 3 \\ 0 & - 4 & 2 \end{array}) + (\begin{array}{ccc} 2 & 5 & 4 \\ 2 & 0 & - 6 \\ 2 & 7 & 1 \end{array})$

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Development:

$(\begin{array}{ccc} 3 & 6 & 7 \\ 0 & 2 & 3 \\ 0 & - 4 & 2 \end{array}) + (\begin{array}{ccc} 2 & 5 & 4 \\ 2 & 0 & - 6 \\ 2 & 7 & 1 \end{array}) = (\begin{array}{ccc} 3 + 2 & 6 + 5 & 7 + 4 \\ 0 + 2 & 2 + 0 & 3 - 6 \\ 0 + 2 & - 4 + 7 & 2 + 1 \end{array}) = (\begin{array}{ccc} 5 & 11 & 11 \\ 2 & 2 & - 3 \\ 2 & 3 & 3 \end{array})$

Solution:

$(\begin{array}{ccc} 5 & 11 & 11 \\ 2 & 2 & - 3 \\ 2 & 3 & 3 \end{array})$

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