Answer:
I suppose you mean 999^2
(1000-1)^2
which comes under the identity
(a-b)^2=
(a^2 + b^2 - 2ab)
hope this helps
 
        
             
        
        
        
Linear: y = 4/-7 x + 4
Standard: (4/7)x + y = 4
        
             
        
        
        
Answer:
Step-by-step explanation:
20% of 30 is 6 are randomly selected.
 
30 choose 6 = 30! / (30-6)! 6! 
 
                  = 30! / 24!6!
 
                  = 30 * 29 * 28 * 27 * 26 * 25 
                    --------------------------------- <-- 24! cancels
                     6 * 5 * 4 * 3 * 2 * 1
 
                  = 29 * 28 * 27 * 26 * 25
                   ---------------------------------- <--- 30 = 6 * 5 cancels
                       4 * 3 * 2 * 1
 
                 = 29 * 7 * 9 * 13 * 25   <--  4 cancels 28, 3 cancels 27, 2 cancels 26
 
                = 593775
 
        
             
        
        
        
Answer:380
Step-by-step explanation:
500-120=380
 
        
                    
             
        
        
        
If the number after the decimal is 1-4 you drop it, if it's 5-9 you add one to the whole number. In 19.6, 6 is 5-9 so you add one to 19- 19.6=20. In 23.8, 8 is 5-9 so add one to 23- 23.8=24. In 38.4, 4 is 1-4 so you drop it- 38.4=38. So the answer is C. 20, 24, 38 :) hope this helps