Answer:
57.5 degrees
Step-by-step explanation:
Assuming this is a triangle
a is adjacent is ∠B
b is opposite of ∠B
Use the inverse tangent equation: 
This equals to 57.52880771
I think the next one is,65.0
The answer is zero.
If any of the pairs of lines were parallel, there would be some same-side interior angles or such that would be supplementary. However, since the lines are not parallel lines crossed by a transversal, the only ones guaranteed to be supplementary to angle 7 are the ones adjacent to it that form a linear pair.
the answer is 9/6 or 1 1/2
