The top 4 firms have (23 +22 +18 +12)% = 75% of the market.
The 4-firm concentration ratio is 0.75 or 75%.
        
             
        
        
        
Answer:
m = 7.8
Step-by-step explanation:
Its the slope. Its the number next to the x.
 
        
             
        
        
        
As the price of the car increases, the number of people 
willing to buy it decreases.
The line in the first graph ' A ' is doing that.
        
             
        
        
        
Answer:
x= -6
Step-by-step explanation:
Notice that a(-6,7) and b(-6,-3) have the same x-coordinate (-6).  This means that x is constant and that the line is a vertical one (x = -6).
The equation of the line through these two points is x = -6.  
 
        
             
        
        
        
<span>1:50 scale  means     1cm  on paper and  <span>50cm in real life . So 18x50=900cm
and the answer is 9m . Hope you enjoy !</span></span>