Hey there!
The first thing that we would really want to do in this problem is first do the math.
I am actually trying my hardest to figure out what does those number's even say, I believe they read 33, but let's just say that it does.
So, if we were doing volume, we would just add all of the sides.
Sense there are 12 sides in a cube, this would give us
. . . . 
99 (cm) =
0.396 (liters)_____________________________________________________________
If we were doing area, we would just multiply

.

Hope this helps you!