Question

What is 6x to the 3 fifths in radical form

Answer 1

Assuming you mean $6x^ \frac{3}{5}$ and not $(6x)^ \frac{3}{5}$

remember
$x^ \frac{m}{n}= \sqrt[n]{x^m}$ so

$6x^ \frac{3}{5}$=$6 \sqrt[5]{x^3}$