X is a variable to find it you need to isolate it(get it by itself)
        
             
        
        
        
Answer:
OK with what 
Step-by-step explanation:
OK with what
 
        
                    
             
        
        
        
Answer:25
Step-by-step explanation:
 
        
             
        
        
        
Answer:
I believe that the third answer is correct..... but I'm not positive. 
Step-by-step explanation:
if you get the third side of the triangle to be 71 then it would go first. Then it would go to 45-55. And lastly to 71-45