Are you good in the brain im your teacher and i see that you are trying to cheat
Answer:
74
Step-by-step explanation:
You subtract 43 from 12 you get 31 then you add 43 and 31 you get 74 bye
Simple...
you have:

You want to find m-->>>
1.)Isolate m

Leaving you with...
F*

=

Keep isolating m-->>>


Square root to solve what just m is-->>>

=

That is how you solve for m...
Thus, your answer.