I don't know how to answer this because i don't know the other numbers. But I can tell you to find a missing angle all the angles must add up to 180. So just add the other numbers and subtract the answer from 180 then you should get an answer.
3.1 (it is the tenth place)
Answer is D
3(2)-12
6-12
F(2):-6
First, subtract the numerators and keep the denominator. so it will be 19/8 then turn into a mixed number which will be 16 1/4
