10(6) + 25 = 60 + 25 = 85
10(2.75) + 25 = 27.5 + 25 = 52.5
10(1.482) + 25 = 14.82 + 25 = 39.82
93 = 10x + 25 || 68 = 10x || x = 6.8
42.1 = 10x + 25 || 17.1 = 10x || x = 1.71
116.25 = 10x + 25 || 91.25 = 10x || x = 9.125
 
        
             
        
        
        
Midpoint formula: (x1+x2/2 , y1+y2/2)
So,  (-1+3/2  , 9+8/2)
-2/2 = -1      17/2 = 8.5
Answer: (-1,8.5)
        
                    
             
        
        
        
Yes, the simplified fraction would 423/500