Answer with Step-by-step explanation:
We are given that A, B and C are subsets of universal set U.
We have to prove that 

Proof:
Let x
Then  and
 and 
When  then
then  but
 but 
Therefore,  but
 but 
Hence, it is true.
Conversely , Let  but
 but 
Then  and
 and  
 
When  then
 then 
Therefor,
Hence, the statement is true.
 
        
             
        
        
        
Answer:
1/25
Step-by-step explanation:
square has 4 sides, if you add them all up you get 4/5.
1/5+1/5+1/5+1/5=4/5
so each side is 1/5
Area=length * width
A=1/5*1/5=1/25
 
        
             
        
        
        
The  study has the smallest margin of error for a 98% confidence interval is <span>The northern California study with a margin of error of 3.2%.
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Answer:
-7
Step-by-step explanation:
 
 
        
             
        
        
        
5x(2y-3)-(y+8)=13 I believe this is correct