Hi there!
A cube basically has same length, width, and height.
So if the length is 2, then the width and height has to be 2.
To find a volume of a cube, you would have to multiply length × width × height.
Since the length, width, and height are all same, you can write the formula as
V = x³
(x is the length, width, and height!)
So your question gives the volume already ; 27cm³.
You would have to multiply same number three times in order to get 27.
∛27 = 3.
3 × 3 × 3 = 27.
So you know that your length, width, and height is 3cm!
The height of the box is 3cm.
Hope this helped!! :)