The statements that must be true are c,e,f, but these are the statements that I think are correct
        
             
        
        
        
They are intertwined the domain is the allowed values of the independent varialbles and the range is the allowed values of the dependent variable.
        
                    
             
        
        
        
Answer:
19.5
Step-by-step explanation:
60 - 40.5 = 19.5.
 
        
             
        
        
        
Answer: 486 glasses of water in 9 weeks
Step-by-step explanation:
54 X 9 = 486
Or you could add 54 to itself 9 times then you will get 486
 
        
             
        
        
        
Youre answer is D, you’re welcome