Answer:
-4 is the answer 
Hope it will helpful for you
 
        
             
        
        
        
Answer:
3500
Step-by-step explanation:
2/100=70/?
2*35=70
35*100=3500
 
        
             
        
        
        
Answer  
Find out the  percent error in Annie's estimate .
To prove 
Formula

As  error = approx value -  exact value 
As given
Annie estimates that the height of a bookcase is 78.25 in. 
The actual height is 75.50 in. 
approx value = 78.25 in. 
actual value = 75.50 in. 
error = 78 .25 - 75 .50
         = 2.75 
put in the formula 


Percentage error = 3.64 % (approx)
Therefore the Percentage error be 3.64 % (approx).
 
        
                    
             
        
        
        
Yeah, x= 7/2 and y= -5/2
Please mark as brainliest and I hope this helps