# How do you evaluate n^2/m if m=2, n=5?

$12.5$
Everywhere in this formula where there is an $m$ substitute $2$ and everywhere there is an $n$ substitute $5$ and then do the arithmetic:
${5}^{2} / 2 = \frac{5 \cdot 5}{2} = \frac{25}{2} = 12.5$