Answer:
f(x) = 7x^9-3x^2-6
Step-by-step explanation:
 
        
                    
             
        
        
        
<span>In order to find the median weight we must arrange the given values in an ascending order and take the middle one. Doing so lets us see that the dog's median weight was 4.8 kg.</span>
        
             
        
        
        
The answer to your question is 
1/4 kilometer = 0.25 kilometers = 250 meters
You answer is 250 meters
        
             
        
        
        
y= 1.25x+6.75
Make 31.75 y because that is the total cost he paid.
1.25x+6.75=31.75
1.25x=25
x=20
So he had 20 refills.