If you are approximating, then you are estimating... therefore your answer would be an estimate.  I hope this helps.
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
You cannot find the exterior angles of any irregular nonagon. If it is a regular one, then you can. A regular nonagon has 9 sides and so 9 exterior angles all of which are equal to 360/9 = 40 degrees. The interior angle = 180 - 40 = 140 degrees.
 
        
             
        
        
        
43x5= 215
215 pupils 
215-200=15 
15 seats
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
![\frac{x^{3} }{\sqrt[6]{x}}](https://tex.z-dn.net/?f=%5Cfrac%7Bx%5E%7B3%7D%20%7D%7B%5Csqrt%5B6%5D%7Bx%7D%7D)


 
        
             
        
        
        
I would try B.
I'm not positive i got it right
(sorry if its wrong)
Hope this helped!
:)