Answer:
The cost per worker goes in five years from $67.81 at 1997, to $394.14 in 2001. It is an increase of $326.33 (481%).

Step-by-step explanation:
The annual cost per worker is modeled by the function:

where x = years from 1997.
We have to calculate the cost per worker from 1997 to 2001, according to the function f(x).
We have:

The cost per worker goes in five years from $67.81 at 1997, to $394.14 in 2001. It is an increase of $326.33 (481%).
 
        
             
        
        
        
Direct variation should be called linear variation.
In this case, the answer is B.
A has the quadratic variation, C has the inverse variation, D has the cubic variation
        
             
        
        
        
The answer is 5. Work backwards: first add 7 to 9, then divide by 2, then subtract 3. 
9+7=16
16/2=8
8-3=5
Cross Check:
5+3=8
8*2=16
16-7=9
Final Answer: 5
        
             
        
        
        
0.008 i think this is the answer
        
             
        
        
        
The probability would be B because it is 8 cubed.