Answer
$\frac{r^3}{t^1{^2}}$
Work Step by Step
You have $\frac{r^3t^-7}{t^1{^2}}$.You have to simplify it:
$\frac{r^3t^-7}{t^1{^2}}$ -apply exponent rule $\frac{x^a}{x^b}$=$\frac{1}{x^b{^-a}}$-
$\frac{t^-{^7}}{t^5}$=$\frac{1}{t^5{^-}{^(}{^-}{^7}{^)}}$=$\frac{1}{t^1{^2}}$
The simplified expression is $\frac{r^3}{t^1{^2}}$
