![\sqrt[7]{12} =12 ^{\frac{1}{7}}](/tpl/images/0198/3046/a10ae.png)
![(\sqrt[7]{3})^{4} =3^{\frac{4}{7}}](/tpl/images/0198/3046/2e771.png)
![\sqrt[7]{81} =81^{\frac{1}{7}} =3^{\frac{4}{7}}](/tpl/images/0198/3046/cadfb.png)
![\sqrt[4]{21} =21^{\frac{1}{4}}](/tpl/images/0198/3046/a834b.png)
![\sqrt[4]{3^{7}} =3^{\frac{7}{4}}](/tpl/images/0198/3046/c92e7.png)
Select all radical expressions that are equivalent to 3 4/7
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