Answer:
The difference between their volumes is 
Step-by-step explanation:
The attachment completes the question.
For cube 1:

For cube 2:

Required
The difference in their volumes
First, we calculate the volume of box 1

Substitute 8 for s1


Next, we calculate the volume of box 2

Substitute 6.5 for s2


The difference is then calculated as:




Hence, the difference between their volumes is 