Answer:
1. multiplication
2. divide
3. the group ()
4. the group with multiplication in it 
Step-by-step explanation:
GEMS
Groups, Exponents, Multiplication/dividing, Subtraction/Adding
 
        
             
        
        
        
Answer:
Step-by-step explanation:
10 dozen is equal to 120 so ratio is 800/120 or 80/12
same ration on the other side but 200/x.Cross multiply and u get 3
 
        
             
        
        
        
Answer:
X
Step-by-step explanation:
CAUSE 
2X=X
DIVIDE BOTH SIDE BY 2 EQUAL ONE AND ONE IS EQUAL TO ( X)
 
        
                    
             
        
        
        
Answer:
( x - 3 )( x + 3 ) ( x - 4 )( x + 4)
Step-by-step explanation:
( x^2 - 9 ) ( x^2 - 16 )
( x - 3 )( x + 3 ) ( x - 4 )( x + 4)
Hopefully this helps!
Brainliest please?