Answer :

To find this out, simply divide 186 by 21. Which is 8.9 (i rounded it)
But you can just multiply (to check) 21 by 8 to geet 168. Any further, you would get a number higher than 186.
~Hope this helped :)
[tex] \sqrt[21]{186} = 0.112[/tex]

You are basically saying 21 divided by 186.