Answer: B) 180°
Explanation:
Angle P and Q forms a straight line which means they add up to 180 degrees. 
So angle P is 50 degrees then we need to find it's supplement. 
Using the equation 50 + x = 180 we can solve for x to find the supplement. 
50 + x = 180 subtract 50 from both sides 
-50 -50 
x = 130