# How do you write r/t^-7 with positive exponents?

Use this rule of exponents to eliminate the negative exponent for the $t$ term:
$\frac{1}{x} ^ \textcolor{red}{a} = {x}^{\textcolor{red}{- a}}$
$\frac{r}{t} ^ \textcolor{red}{- 7} = r {t}^{\textcolor{red}{- - 7}} = r {t}^{7}$