Answer:
The value remains under the radical is 3.
Step-by-step explanation:
Given : When 9 Superscript two-thirds is written in simplest radical form.
To find : Which value remains under the radical?
Solution :
The expression given 9 Superscript two-thirds is written as,

We re-write the expression as,

![9^{\frac{2}{3}}=\sqrt[3]{9^2}](https://tex.z-dn.net/?f=9%5E%7B%5Cfrac%7B2%7D%7B3%7D%7D%3D%5Csqrt%5B3%5D%7B9%5E2%7D)
![9^{\frac{2}{3}}=\sqrt[3]{81}](https://tex.z-dn.net/?f=9%5E%7B%5Cfrac%7B2%7D%7B3%7D%7D%3D%5Csqrt%5B3%5D%7B81%7D)
![9^{\frac{2}{3}}=\sqrt[3]{3\times 3\times 3\times 3}](https://tex.z-dn.net/?f=9%5E%7B%5Cfrac%7B2%7D%7B3%7D%7D%3D%5Csqrt%5B3%5D%7B3%5Ctimes%203%5Ctimes%203%5Ctimes%203%7D)
![9^{\frac{2}{3}}=3\sqrt[3]{3}](https://tex.z-dn.net/?f=9%5E%7B%5Cfrac%7B2%7D%7B3%7D%7D%3D3%5Csqrt%5B3%5D%7B3%7D)
Therefore, the value remains under the radical is 3.