Consider the given expression,
[tex]4m+8m[/tex]It is observed that both terms are alike, and like terms can be added or subtracted directly.
So, the expression is simplified as,
[tex]4m+8m=(4+8)m=(12)m=12m[/tex]Thus, the given expression gives 12m upon simplification. So this will be the equivalent expression.
Therefore, the third option is the correct choice.
