We have
-9 + 7 = -2 
You can also rewrite this as
7 - 9 = -2 
If it makes you more comfortable.
Hope this helps.
 
        
                    
             
        
        
        
Answer:
   The solution to the system of equations (x, y) = (2, 4) represents the month in which exports and imports were equal. Both were 4 in February.
Step-by-step explanation:
We're not sure what "system of equations" is being referenced here, since no equations are shown or described.
__
Perhaps your "system of equations" is ...
   f(x) = some equation
   g(x) = some other equation
Then the solution to this system of equation is the pair of values (x, y) that gives ...
   y = f(x) = g(x)
If x represents the month number, then the solution can be read from the table:
   (x, y) = (2, 4)
This is the month in which exports and imports were equal. Both numbers were 4 in February.
 
        
             
        
        
        
Answer:
d. 18x^3-27x^2y
Step-by-step explanation:
(3x)^2(2x-3y)
work out the first term
9x^2(2x-3y)
distribute
18x^3-27x^2y
 
        
                    
             
        
        
        
Answer:
13
Step-by-step explanation:
-2x + 6 = -20
Step 1 subtract 6 from both sides
6 - 6 cancels out 
-20 - 6 = -26
We now have -2x = -26
Step 2 divide both sides by -2
-2x/-2 = x 
-26/-2 = 13
We're left with x = 13
 
        
             
        
        
        
Answer:
data and analysis djdjdjhdhd