the complete question in the attached figure
we know that
the rectangular prism has 2x3x3 boxes.
Each small box has a dimension of 1/3 in all sides.
So
[the volume of the prism]= (3/3)* (2/3)* (3/3)
[the volume of the prism]= (18/27)--------> 2/3 in³
the answer is
the volume of the prism in cubic inches is 2/3
see the attached figure