Answer:
C
Step-by-step explanation:
2m + 2n + 7
The reason this is the answer is because:
When combined the like terms of the problem you just have to add up each factor.
(m + n + 3) + (m + n + 4)
so if you add both M's you get: 2m
if you add both N's you get: 2n
and if you add 3 and 4 you get: 7
Then you put it in the order of the first parenthesis and you get the answer 2m + 2n + 7.
