Oder of operations is this;
 
        
        
        
Order of the people does not affect the total number of ways. Thus, we use combinations.
Total combinations: 20C5 = 15,504 ways.
        
             
        
        
        
Answer:
   (b)  2.71828 . . .
Step-by-step explanation:
If your calculator does not have an 'e' button, you can have it compute e^1 using the exponential function button.
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   e ≈ 2.718281828459045...
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Like pi, 'e' is a transcendental number, a number that is not the root of any polynomial with integer coefficients.
 
        
             
        
        
        
Y = 2
slope = 0
hope it helps
        
                    
             
        
        
        
See the attached picture: