Take half of the coefficient of x (which is 2/5) and square it:
[ (1/2)(2/5) ]^2 = (1/5)^2 = 1/25, or 0.04
Thus, to rewrite x^2 + (2/5)x to include a perfect square trinomial,
x^2 + (2/5)x  = x^2 + (2/5)x + (1/5)^2 - (1/5)^2, or
                 (x+1/5)^2 - (1/5)^2, or (x + 1/5)^2 - 1/25
        
                    
             
        
        
        
5% sales tax would be $0.70
        
                    
             
        
        
        
Answer:
14
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
36 people
Step-by-step explanation:
If the yearbook club had 1/2 the participants attend the meeting, than all of them would be represented by 18 x 2, or 36 (since two halves make a whole)