Express each power as an equivalent radical.

Question

K. I don't know how to write this, but I'll explain.

There is a fraction. 1 over 9. And 9 has a power up to it which is 5 and a power down which is 3. I don't get how to express this power as an equivalent radical. I checked the answer at the back of the book, and it is 1 over 9 in brackets. beside it there is 1/3 in small font like a power, next to big one in 1/9. then there is 5 outside the other brackets.