Evaluate -3m+4: Substituting m=2 and m=-1/2

Let's start with the first option.

Let's write the division exercise in the expression as a simple fraction:

$\frac{m}{-3m}+4=$

Note that we can reduce the m in both the numerator and denominator of the fraction to get:

$\frac{1}{-3}+4=$

Since we are dividing a negative number by a positive number, we will get a negative result:

$-\frac{1}{3}+4=3\frac{2}{3}$

Let's continue with the second option.

Since in the previous exercise we saw that we can reduce the m in the numerator and denominator of the fraction, we'll do the same thing here and therefore reach the same result:

$3\frac{2}{3}$

Therefore, the final answer is that for any m the expression will equal -3 and two thirds.