Answer:
Step-by-step explanation:(
 
        
                    
             
        
        
        
Answer: no
Step-by-step explanation: 48f does not equal 8.6f
 
        
             
        
        
        
Hey there! 
<h3>"Expanded form" is basically, setting it up in a addition form to give you that result</h3>

Good luck on your assignment and enjoy your day! 
~
 
        
             
        
        
        
Functions cannot have multiple outputs with the same input
Solution: D is the only function
        
                    
             
        
        
        
Zinc = 7/18
Divide 4.9 by 7 = 0.7
Multiply by 18 = 12.6
The answer is 12.6 lbs of alloy. Sorry if I'm wrong