The answer to number 9 would be 43.
Since it tells you that there is a straight angle that would equal 180. So I added up 61 30 and 46. I got 137. Then subtracted 137 from 180 and got 43.
I'm not good at graphing, but desmos.com is an online graphing calculator that works really well.
46.8 is 39% of 120. Hope this helped you!
5. terms are separated by + and - signs