Answer:
A filter.
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
400cm^2
Step-by-step explanation
equation: a+b/2 x h
19+25/2 x 20
44/2 x 20
22 x 20
440 (don't forget unit) and to square because we are finding the area
 
        
                    
             
        
        
        
Answer:
option A y=9/x
Step-by-step explanation:
It is said that two variables x and y vary inversely if the increase of one of the variables causes the other to decrease.