Answer:
Simple random sampling
Step-by-step explanation:
Hope this work :)
 
        
             
        
        
        
Rain : sunny : overcast 
7:11:3
7x + 11x + 3x = 366
21x = 366
x = 366/21
x = 17.43
7(17.43) = 122.01 days rain
11(17.43) = 191.73 days sunny
3(17.43) = 52.29 days overcast
        
                    
             
        
        
        
Ill try to answer your question
        
             
        
        
        
(-2x+4)+2(2x+1)= -2(-x-3)