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Twelve flute players.
Eight trombone players.
20 total of flute and trombone players.
        
             
        
        
        
Step-by-step explanation:
x+y=84
x²=y+6
y+6+y=84
2y+6=84
2y=84-6
2y=78
y=39
x=84-39=45
 
        
             
        
        
        
3x+x= 180°(straight angle)
4x= 180°
x= 180/4
x= 45°