The set A U B is represented by shading both circles A and B (also the overlapping region as well). Any point in set A U B will be in either A, B or both. 
        
                    
             
        
        
        
Is there an a choice ? Or are those all the choices, just making sure
        
             
        
        
        
That is not true there is a person and that person is called god and he created us sense day one and he sent down Jesus to die on the cross for our sins and he went through the worst thing imaginable just to save us from our sins. If you don’t believe me look it up and it will tell you who created us so you should be thankful you are here today if it wasn’t for Jesus you would not be here who ever said that is wrong trust me.
        
             
        
        
        
The length of side b is 7.61 m.
Here's how the length was calculated:
Let:
length of side a = 12 centimeters
B = 36 degrees
C = 75 degrees
In order to solve an AAS triangle, use the three angles, add to 180 degrees to find the other angle, then, use The Law of Sines to find each of the other two sides.
A = 180 - (36 + 75) = 69 degrees
by using the law of sines:
a / sin A = b / sin B = c/ sin C
we will substitute the given values:
12 / sin (69) = b / sin (36)
b = unknown
12 / 0.93 = b / 0.59
12.9 = b / 0.59
b = 12.9 * 0.59
b =7.61 cm (length of side b)