Vertical angles are equal to each other, so:

the reason why the value is not an integer, is most likely because the 21.2<span>° is just an approximation.</span>
1. 4-4= 0
2. (-4)4= -16
3. -4-4= -8
A. 12
12 isn’t a polynomial because the definition of a polynomial is an expression of more than two algebraic terms, especially the sum of several terms that contain different powers of the same variable(s). So your answer will be A