Answer
$-1\frac{5}{8}$
Work Step by Step
We have $$-m-3n$$
Where $m = \frac{1}{2}$, $n=\frac{3}{8}$
Then if you substitute each letter by her value $$-\frac{1}{2} - 3*\frac{3}{8} = -\frac{1}{2} - \frac{9}{8} = \frac{-4-9}{8} = \frac{-13}{8} = -1\frac{5}{8}$$
