The correct answer is 
III, I, II, IV
8a - 5
6x2
18x3 + 5ab - 6y
4x3y + 3x2 - xy - 4
        
                    
             
        
        
        
The answer is 4.7 x 10^-4
If you move the decimal to the right, the exponent will be negative. If you move it to the left, the exponent will be positive.
        
             
        
        
        
You would need one because you arent yet to 20 so it takes one tenth for example;
1.7 or 7/10
Thats my guess tho man if it is more complicated than that, SORRRYYYY
        
             
        
        
        
Answer:
1/4
Step-by-step explanation:
y=1/4x-4
This equation is in the form
y = mx+b  where m is the slope and b is the y intercept
The slope is 1/4 and the y intercept is -4