Answer:
i think the answer is -y^2/20 + 2y/3 - 1/4
 
        
             
        
        
        
It is 2 and 3/5 your welcome :) 
        
             
        
        
        
Ms. Alonzo received 400 markers because one tenth of 4000 is 400. Hope this helped! 
        
                    
             
        
        
        
It would be...
(18 +28) divided by two
then take that and multiply it by the height - 5
the 6 in this equation doesn't matter because it is not the height of the shape
 
        
             
        
        
        
Abcissa is x, and ordinate is y.
In this case the x is positive, and the y is negative.
Therefore, the answer is "positive, negative"