A conservative vector field 

 has curl 

. In this case,

so the vector field is not conservative.
 
        
        
        
Answer:
13.5
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
x=21
Step-by-step explanation:
well, geez - just do the math!
3/7 * 49 = 21
 
        
             
        
        
        
If you have built 25 cars, and they are 36 dollars per, then multiply 25 and 36 for the amount of money.  This will result with 25*36=900.  Since we already have 900 dollars worth, we subtract that from the goal of 1620, leaving us with 1620-900=720.  Now, divide this by the price per car for the amount of cars needed to get to this goal. 720/36=20 cars
Hope this helps!
        
                    
             
        
        
        
i think the answer would be 33%