Answer:
1.C.
![7\sqrt[3]{x^2}](https://img.qammunity.org/2020/formulas/mathematics/middle-school/dbpu2j8pesnj4mwl80k3fl6fv2ir3wuahq.png)
2.D.

Explanation:
 We are given that 

We have to write given rational exponent in radical expression
Radical expression: The expression contain square root , cube root , fourth root etc.
![7(x)^{(2)/(3)}=7\sqrt[3]{x^2}](https://img.qammunity.org/2020/formulas/mathematics/middle-school/zqpdfo3e1jnzt4f0c38zdenpkdxl1pq1jp.png)
Hence, the radical expression =
![7\sqrt[3]{x^2}](https://img.qammunity.org/2020/formulas/mathematics/middle-school/dbpu2j8pesnj4mwl80k3fl6fv2ir3wuahq.png)
Option C is true.
2.

We have to simplify
We know that 

Apply this rule 


Hence, option D is true.