Answer:
I believe the answer is b
Step-by-step explanation:
I might be wrong
The square of a binomial is written like

In your case, you have
, which implies 
So, we want to write

But our left hand side is

If we add 26 to both sides, we have

Answer:
No. Of slices my friend eats = No. Of slices eaten by me - No. Of slices my friend eats fewer than me
= 5 - 2
= 3
Hope this helps!
I believe that the answer is 20. I am not entirely sure though.