Answer:
[tex]\sqrt[n]{a}[/tex]
1. [tex]\sqrt[3]{27}[/tex] = [tex]\sqrt[3]{3^3}[/tex] = 3
2. [tex]\sqrt[4]{16}[/tex] = [tex]\sqrt[4]{2^4}[/tex] = 2
3. [tex]\sqrt[6]{64}[/tex] = [tex]\sqrt[6]{2^6}[/tex] = 2
4. [tex]\sqrt[5]{243}[/tex] = [tex]\sqrt[5]{3^5}[/tex] =3
Hope that helps!