Volume of cube =

=> 30 =

So, Side =
![\sqrt[3]{30}](https://img.qammunity.org/2018/formulas/mathematics/middle-school/ua2ix03sbo8oymownbvwfghg048uywm0h4.png)
Side = 3.107232......... and goes on.
Cube root of 30 is not a natural number or a terminating decimal number.
It is a non-terminating decimal number. So, physically it is not possible to find an edge length that will give volume 30 cubic units