What is the perimeter of a triangle with side lengths of 9, 12, and 4x?
       
      
                
     
    
    
    
    
    1 answer:
            
              
              
                
                
The answer is 21 + 4x.
You find this answer by adding up all the sides.
9+12+4x= 21+4x ... you don't add 4x because it has a variable that we do not know of the value.
                                
             
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Say it in english so i cant try to help
        
             
        
        
        
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