Step-by-step explanation:
20 x 399 x 5
= (20×5) × 399
= 100×399
= 39,900
 
        
             
        
        
        
Someone steals 500, your balance is -500
Same person gives you 100, your balance is -400
You give them the 400 change, your balance is -800
        
                    
             
        
        
        
Answer: First off, what answer are you looking for? it's hard for me to answer something without specification.
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
12
Step-by-step explanation:
 
        
                    
             
        
        
        
The answer is

.
Before we rationalize the denominator, we must simplify the numerator and denominator.  We evaluate the square root on the top, and combine like terms on the bottom:

To rationalize the denominator, we multiply by the conjugate.  The conjugate is found by making the imaginary term of the complex number, the i part, the opposite sign.  The conjugate of -2-i is -2+i:
