Answer:
A,D, and E are the answers on E2020
 
        
             
        
        
        
there's no exact answer for it because pi goes on forever
 
        
                    
             
        
        
        
Answer:
48 (i might be wrong)
Step-by-step explanation:
180-66-66=48 
 
        
             
        
        
        
I think you need to make the 6 positive and then add it to 13 which would give you a=19