What simplifies into 2mn^2*^3√5mn^2

We have: 2mn^2 √5mn^2, where √ is a cubed root.

Hence, we can do (2mn^2) ^3 to get 8m^3n^6. Now we'll take that into the root:

√5mn^2*8m^3n^6 = √120m^4n^8

So, √120m^4n^8 simplifies into 2mn^2 √5mn^2.