I think its 12.
I could be wrong. Let me know.
-Steel jelly
For this case, we have the following expression:

We simplify the expression:
If we add similar terms, taking into account that different signs are subtracted and the sign of the greater one is placed, we have that 
So, we have to:

Answer:
-3x + x + 5 = -2x + 5
8*4-4/2+1
32-4/2+1
32-2+1
=31 answer
So, the answer to this question is 31
aound 15 or it depends how many slices there were in the first place
I believe the answer would be 15,626 , since to find the square inches you just multiple to two measurements together, hope this is right