A is the answer and i am in 6th grade
        
                    
             
        
        
        
Answer:
It's the first option.
Step-by-step explanation:
It is turned down so the one half is negative (-1/2) 
parabola will be in the form of a(x-h)^2 + k. (-h, k) is your vertex, in this case that is (15,25). so in the equation, you will have 
-1/2(x-15)^2 + 25. first one.
Hope this helps!
 
        
             
        
        
        
Let length of rectangle=x and width be y
.`. area=x*y
now new length=x+12x/10=22x/10
width=y-y/5=4y/5
now .....
new area=new length-new width=22x/10*4y/5
new area=88xy/50