Use the site called Desmos, it's a graphing calculator and should help you in all the ways you need. It isn't complex. Just put that equation in a box and it graphs it for you.
 
        
                    
             
        
        
        
Answer:
sir the picture is black 
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
c
Step-by-step explanation:
 
        
             
        
        
        
If you’re cutting it into half inch pieces, you’ll take the length of the roll and multiply it by 2, so 13•2=26