Suppose there are 19x students, 1x teachers
19x+1x=400
20x=400
x=20
there are 20 teachers and 380 students. 
        
             
        
        
        
Answer:
x = -2 and x = 5/4
Step-by-step explanation:
The image below shows step-by-step on how to solve it.
Hope this helps! :)
 
        
             
        
        
        
The probability is zero because there is only red green and blue
        
             
        
        
        
4
22
-12
those are the right answers
        
                    
             
        
        
        
Answer:
   class assignment seems to discriminate against Art Club members
Step-by-step explanation:
The probability of getting the requested assignment given that the student was in Art Club was ...
   P(got class | art club) = P(got class & art club)/P(art club)
   P(got class | art club) = (100/500)/(165/500) ≈ 60.6%
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   P(got class | not club) = P(got class & not club)/P(not club)
   P(got class | not club) = (265/500)/(335/500) ≈ 79.1%
It looks like George's theory may be incorrect, as a significantly greater percentage of non-club students got their requested class than did club students. The class assignment process and art club membership are not independent, suggesting an unfair disadvantage for club students.