That looks like a rectangular prism
Answer:

Step-by-step explanation:
Power (denoted by P) can be defined as a function of work (denoted by W) and time (denoted by t) using this formula:

Unit of Work = 
Unit for Time = s
Therefore, the Unit of Power


An appropriate unit for power is: 
The difference is 6 because it is what we get when we subtract 8 and 2.
Final answer: 6