1. **Problem Statement:** We need to find an expression equivalent to $$\frac{r^3}{t}$$. 2. **Understanding the Expression:** The expression is a fraction with numerator $$r^3$$ and denominator $$t$$. 3. **Equivalent Forms:** To find equivalent expressions, we can use properties of exponents and fractions. 4. **Rewrite the Expression:** $$\frac{r^3}{t} = r^3 \cdot \frac{1}{t}$$. 5. **Alternative Forms:** This can also be written as $$r^3 t^{-1}$$ using negative exponents. 6. **Summary:** The expression $$\frac{r^3}{t}$$ is equivalent to $$r^3 t^{-1}$$ or $$\frac{r \cdot r \cdot r}{t}$$. **Final Answer:** $$\frac{r^3}{t} = r^3 t^{-1}$$.