The answers are:
1) 
2) 
3) 
The explanation for this answer is shown below.
1. To solve this problem you must apply the following proccedure:
2. You have the function 
3. You must switch
and
and then solve for
:

4. Finally, you obtain:

Answer:
x = 84°
Step-by-step explanation:
The inscribed angle x is half the measure of the intercepted arc, that is
x = 0.5 × 168° = 84°