Answer: Option 'C' is correct.
Explanation:
Since we have given that
[tex](m+n+3)+(m+n+4)[/tex]
We need to calculate the sum of polynomial for which we will group the like terms and add them.
So,
We first grouping the like terms , i.e.
[tex]m+m+n+n+3+4[/tex]
Now, add the like terms, we get
[tex]2m+2n+7[/tex]
Therefore, the sum of above polynomial is
[tex]2m+2n+7[/tex]
Hence, Option 'C' is correct.
