Divide the number of decorations made in 3 and a half hours by 3.5.
280/3.5= 80
They can make 80 decorations per hour 
Hope this helps!
        
             
        
        
        
Antarctica and asia
I hope this helps
        
             
        
        
        
I'd say that the relationship between y and x is that they're both equivalent to each other, since -3 = -3.