When I did the math I came up as 3.88 but if you have to round up it wound be 4 or 3.9
3 should be added to the tiles
Answer:
The volume of this rectangular prism is 112mm.
Step-by-step explanation:

Answer:
C) (x-3)(x+3)
Note:
Just a tip there is an app called Desmos where you can put in equations like this and it will graph them for you.