Answer:
i honestly dont know this but im guessing its about 12th grade work.
Here are some possibilities:
a.) 9 + -9 = 0
b.) 8 + 2 + -10 = 0
c.) 6 + 4 + -2 + -8 =0
I need a picture of the map duh.
- Chilio
it would be -10,200 per year