The answer is 1,000 4 or below you round down and 5 or higher you round up
        
                    
             
        
        
        
Answer:21
Step-by-step explanation:
x=length
x(x-6)=315
x^2-6x=315
x^2-6x-315=0
(x-21)(x+15)
x=21, x=-15
x cannot be negative so the only answer is 21
 
        
             
        
        
        
6/25.2
Multiply both sides by 5 so 25.2 is a whole number:
30/126
and then simplify by dividing by 6: 
5/21 which is equal to 0.2381.
Hope this helps :)
        
             
        
        
        
Answer:
n(U)=200
n(M)=140
n(S)=120
n(MuS)complement=40
n(MuS)=n(U)-n(MuS)complement
 =200-40
 =160
n(MnS)=n(M)+n(S)-n(MuS)
 =140+120-160
 =260-160
 =100
 
        
                    
             
        
        
        
8/18 because just times them by 2 and it will be 8/28.