Answer:
dherherth
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Its the instrument that measures unknown quality of goods.
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
x=20
Step-by-step explanation:
inverse operation
add 7 to both sides 
x=20
 
        
                    
             
        
        
        
C. 496 is the perfect number
        
             
        
        
        
The answer is D) All the steps and the answer are correct. :) 
You can just solve using the steps to see if they are right. For example, is -1x17=-17? Yes.