a.
You can use the rule:
[tex](a^b)^c=a^{b*c} [/tex]
So, let's do it:
[tex](27x^6)^ \frac{1}{3} = 27 x^{6* \frac{1}{3} } [/tex]
Simplify:
[tex](27x)^2[/tex]
And there you have it. If you need it one step further, then square 27, but take the parenthesis out.
If you need further help, feel free to ask for it.
