Answer:
8
Step-by-step explanation:
3^2 = 9 - 1 = 8
 
        
             
        
        
        
Answer:
Step-by-step explanation:
A)
The parallelogram area formula is  b*h  just like a square but the height is the distance from the base to the parallel top .. not the side length.. that's the only difference.
the base is  x+4
total area is 5x+20
so use those in our formula
area = b*h
5x+20 = x+4 * h   now solve for h   (yes we'll have an x in the other side, but that's okay b/c their formulas do also)
(5x + 20) / (x+4) = h
B)
area = b*h
8x-24 = b*8
(8x-24)/8 = b
8x/8  - 24/8  = b
x -3 = b
C)
area = b * h
12x + 6y = 6 * h
(12x + 6y) / 6 = h
12x/6  + 6y/6  = h
2x + y = h
voila you're don :)
 
        
             
        
        
        
5.8/ sqrt 80=0.648 I think you are asking for the standard margin 
Hope this works
        
                    
             
        
        
        
10 i think..... plz don't report me