Simplify.
(m + 11) + (n + 44)
a) m + n + 84
b) m + n + 55
c) mn + 55
d) mn + 484

(m + 11) + (n + 44) = m + 11 + n + 44
                               = m + n + 55
It is not at all possible to add m and n because they are different variables. The simplified form of the one given in the question is m + n + 55. From this deduction, we can easily conclude that the correct option among all the options that are given in the question is the second option or option "B". I hope that this is the answer that has actually come to your desired help.