563+8=571 burgers to start with
Answer:
If he gave 1 part to his friend then he will have 3 parts left. Is that what you needed help on?
75.4
12 would be considered the radius
C = 2 pi R
so just insert that into the formula and the answer should be
75.39 but if you round up it would be 75.4
All I got was:

I simplify what you gave me and I got that.
Hope This Helps!!