Vertical angles are congruent, so
107=3x-4
3x=111
x=111/3=37°
You get 2m+m-3n which simplifies to 3m-3n
A
It is a first degree polynomial (aka linear because its highest power is 1) and it has two terms (2x and 8)
It does not have eight terms and is not a monomial (one term ie 3x^2)
It is 9 because all the other numbers are in the 80s and 90s 9 is way to low.
