Answer:
8.48%
Step-by-step explanation:
Given that,
The estimated bill = $480
Actual costing of the bill = $524.50
We need to find the percent error in the bill. It can be calculated as follows :

So, the percentage error in the bill is 8.48%.
 
        
             
        
        
        
takes her 20 minutes to walk 1/2 a mile  
2 miles=80 minutes  
1/4= 10 minutes i think  
so 80+10=1 1/2 
{This is not my work!!!}
 
        
                    
             
        
        
        
something through 1-10. i think its 7 but i rlly dont know. Sry.
 
        
             
        
        
        
It is 5 because you have to do 12 squared minus 13 squared and then square root that which equals 5