Simplify
1.
[tex] \sqrt[7]{ - 5 {}^{7} } [/tex]
2.
[tex] \sqrt[4]{625} [/tex]
3.
[tex] \sqrt{512m {}^{3} } [/tex]
4.
[tex] \sqrt[ - ]{27 \times{}^{6}y {}^{12} } [/tex]
plss help me.​