Answer:
21
Step-by-step explanation:
 
        
             
        
        
        
Answer:
C- Equilateral triangle
Step-by-step explanation:
I am not very sure dear 
 
        
                    
             
        
        
        
A + s = 279
s = 2a
a + 2a = 279
3a = 279
a = 279/3
a = 93 <=== adult
s = 2a
s = 2(93)
s = 186 ....students
        
                    
             
        
        
        
Your percent is going to be <span>-203.008</span>