Answer:
6. 107° because they are adjacent to one another
7. Yes because the angles could possibly be different, making the comparison between other angles wrong.
8. They are on the same side in the same position on each of the parallel lines, so they are equal
9. They are interior adjacent angles, across from one another on different lines.
10. If they are not parallel, the angles between the two lines may be different because they are off by at least one degree for the horizontal line