Answer :

Volume of a cube is
Volume=length×width×height

Substitute in the value
Volume=11×11×11

Volume=1331

The answer to your question is C. The volume of a cube with a side length 11 is 1331.

I hope this has helped.
AL2006
The volume of a cube is

(length of a side) x (length of a side) x (length of a side)

usually written as  (length of a side)³  or (length of a side) cubed.

If the length of a side is 11 units, then the volume is

(11 units) x (11 units) x (11 units)  = 1,331 units-cubed.

None of the choices on the list is correct.  The nearest one is 'C'. 
It has the correct number but the wrong units.