i see were u got that from but this 1 is confusing.

6 (index 3) square root of 36 times 2 (index 3)square root of 6

Please use the following for roots:
sqrt
cubroot
etc. Those, with parenthesis, make the problem clear.

6 cube root of 36 times 2 cube root of 6

6 cubrt 36 + 2 cubrt 6
I don't see that it can be combined.

Well according to my homework it said simplify...so wouldnt u multiply the outside numbers than the inside numbers...to get 12 cube root of 216, which would equal 72?

Yes.