Answer:
x = 12
Step-by-step explanation:
By basic proportionality theorem, 
 

 
        
                    
             
        
        
        
Answer:
1) 1       2) 1/729      3) 1/27                  4) -1/729
Step-by-step explanation:
plug them into calculator
 
        
             
        
        
        
Answer:
a
Step-by-step explanation:
 
        
             
        
        
        
Answer:
5
Step-by-step explanation:
The fractions already have a common denominator of 5