33 is composite 
49 is composite 
21 is composite
        
             
        
        
        
This is solved by breaking the equasion down.
2 { 5 [12 + 5 (500 - 100) + 399 ]}
2 { 5 [12 + 5 (400) + 399]}
2 { 5 [12 + 2000 + 399]}
2 { 5 [2411]}
2 {12055}
24110
Is this the answer you were looking for?
 
        
                    
             
        
        
        
Answer:
x= -6
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
10y-12
Step-by-step explanation: