Can i get on these three questions? !

Question #1:

We need to make sure that we pick one of the answers that have to (180) degree symbol mainly because, this is a 180 degree and not a 90 degree.
So, when solving this kind of problem, We would first want to solve the numbers that are shown.

So, in this case, we solve (31°-40°). And what ever this answer would give us, we would then subtract this by (180°), because this is a (180°) angle.

Your  

Question #2:

This is a right angle, so this would then include that we would use (90°), and not (180°). So, because of this, we would subtract the number that is shown, to the degree of this right angle, which would be 90.

Let's consider!



Your  

Question #3:

This is clear to be simple, when an angle is (vertical), this would automatically make this angle congruent. This would then signify that the answer is (31).

Ummm ok. for informing us