The opposite of -4.1 would be 4.1
        
                    
             
        
        
        
Jolly had 12 burgers from the start.
if his five friends ate 2, you'd multiply that and get 10, then you add how many Jolly ate, which is 12.
        
                    
             
        
        
        
No change in area if sides of rectangle are equal.
Hope this helps.
 
        
             
        
        
        
2x + 9 = 43 This is the equation.
2x = 34 Subtract 9 from both sides.
x = 17 Divide both sides by 2.
        
             
        
        
        
I think we need a coordinate grid for that,,