rows and 
columns is 
.![\left[\begin{array}{ccc}2&-4\\-4&10\\0&-8\end{array}\right]](/tpl/images/0354/7539/dfef1.png)
![\left[\begin{array}{ccc}0&-4&6\\2&-10&4\end{array}\right]](/tpl/images/0354/7539/73812.png)
.
as it has 3 rows and 2 columns.
as it has 2 rows and 3 columns. 
Evaluate a + 3b if possible. asap!
...
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