Answer:
probability that the child DOES NOT play the piano

Step-by-step explanation:
A students' choir contains 25 children 
n(S) =25
The number of students play the piano =5
Let 'E' be the event of the child play the piano so n(E) =5
The probability of that the child play the piano 
  
  
Let 'E⁻ be the event of the child play does not play the piano


<u>Conclusion</u>:-
probability that the child DOES NOT play the piano

 
        
             
        
        
        
If you want to check if your answer is correct, expanding it all out will help!
(x-6)(x+2)=0 <-- Use FOIL tactic 
x²+2x-6x-12=0
x²-4x-12=0 
As you can see, this is identical to the initial equation given. The x values would be 6 and -2, as seen from the factored equation. 
Hope I helped :) 
        
             
        
        
        
Answer:
Yes it does it forms a right triangle.
Step-by-step explanation:
 
        
                    
             
        
        
        
18 boys represents the boys