6. Yes: these two angles are opposite 2 equal line.
7. No: We don't know that AC bisects <JAD
8. No: We don't know that JCA or DCA are right angles.
9. Yes. Both angles have AC in common. JD is a straight line which has 180 degrees. AC intersects a JD and creates 2 angles. We know their total but not their equality.
10. Yes. They are given as equal.
Not everything you see is true just because it looks that way.
