It's the third power (cube) of the length of any edge.
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This is clearly lifted from some test paper, omitting the vital diagram. The volume of a rectangular prism is the area of the base multiplied by the height. Same for a cube.
volume is to a cube volume is to a cube
It is 4.5*(Volume of Cube).
The volume of Cube B is 216 cm3
Units cubed are units in the third power (units3), it is often shown when dealing with the volume of 3D objects/shapes.