# How do you simplify r/t^-7?

$\frac{r}{t} ^ - 7 = r {t}^{7}$
Now ${t}^{-} 7$ $=$ $\frac{1}{t} ^ 7$.
Thus $\frac{r}{t} ^ - 7 = \frac{r}{\frac{1}{t} ^ 7} = r {t}^{7}$