An exponent rule that applies to this scenario:
When you multiply two exponents with the same base together, you can add the indexes together. For example, if you had y * y
², you could make it y³, by adding the indexes of 2 and 1.
In this scenario, you can look at the last choice, where it has

* x. You add the indexes of 9 and 1, to get
![\sqrt[3]{ x^(10) }](https://img.qammunity.org/2019/formulas/mathematics/high-school/x8zvg64kl3dtbolpirk1rj1u2qctfjxd9v.png)
That's equivalent to the equation given, so your answer would be the last choice.