


Stationary points occur where the derivative is zero. The denominator is positive for all 

, so we only need to worry about the numerator.


 for all 

, so we can divide through:

But 

 for all 

, so this function has no stationary points...
I suspect there may be a typo in the question.
 
        
             
        
        
        
12 more boys than girls
ratio of boys to girls = 7:5
thus 2/12 is difference between boys and girls = 12
total students = 12 ÷ 2/12 = 72
 
        
             
        
        
        
The best unit to measure the capacity of water, would be gallons