The answer is -0.34. hope this helps
Answer:

Step-by-step explanation:
I am assuming that you mean (4,−9) and (8, -3).

Hope this helps.
Answer:
4 and 10/2 so actually 9
Step-by-step explanation:
8 is b because a circle is 360.
Answer:
there doesnt seem to be much information, but from what it looks like it looks like it is 20?