Answer:
c
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
I think its C.4
Step-by-step explanation:
 
        
             
        
        
        
10:4, 15:6, and 20:8. All you do is add the original ratio to its self
        
                    
             
        
        
        
Answer:
The second city is 54 miles behind the first city
Step-by-step explanation:
The first bus is assumed to go ahead of the second bus and is moving at 54 mph. The second bus is moving at a speed such as 54 mph is 60% (0.6) of its speed.  
The speed of the second bus is then 54/0.6 = 90 mph
When 1 and a half hour has passed, the first bus has moved a distance of
 = 81 miles
 = 81 miles
The second bus (behind the first bus) has moved
 = 135 miles
 = 135 miles
The problem states they both meet in that time, it can only be possible if the second bus departed a distance 135 - 81 = 54 miles behind the first city
So, the second city is 54 miles behind the first city
 
        
             
        
        
        
Your answer is:
(125 - 8x^3) / (25 + 10x + 4x^2) = - ((2x - 5) * (4x^2 + 10x + 25)) / (4x^2 + 10x + 25) = - (2x - 5) = - 2x + 5
The correct result would be - 2x + 5.