Answer:
1 and 3  
Step-by-step explanation:
1 and 3 are vertical angles 
 
        
             
        
        
        
Step-by-step explanation:
You have to use logarithms.
1) a = log_3 (1/27) = -log_3 (27) = -3
2) b = log_3 (9 * 3^(1/2)) = log_3 (3 ^ {5/2}) = 5/2
3) c = -log_3 (sqrt3) = -1/2
 
        
                    
             
        
        
        
14 students should have red hair, if that's what you're asking.
        
             
        
        
        
Answer: In 12 months they will have the same amount, which will be $520.
Step-by-step explanation:
220 + 25m = 100 + 35m 
m = month
Subtract 100 from each side 
120 + 25m = 35m
Subtract 25m from each side 
120 = 10m
Divide each side by 10
12 = m
 
        
                    
             
        
        
        
Step-by-step explanation:
the answer is 42 because 2 times the 21 equals 42