Answer:
Step-by-step explanation: 2 is the real population
 
        
             
        
        
        
Answer:
10
Step-by-step explanation:
If you count ten seconds before the next thunder/lightning, then divide by 5, you'll get 2. 
2=2 miles
 
        
             
        
        
        
Answer:
r=-7
Step-by-step explanation:
 
        
                    
             
        
        
        
Lets say the 3x3 Matrix is 
M =   [1   5   2 ]
         [1   1   7 ]
         [0  -3   7 ]
We apply the Gauss-Jordan elimination method
 (Procedure and result shown in the image below)
 
        
        
        
11. you do 3x3=9 then plus 9+2 = 12 then 12 x 12 = 144
sorry idk 10.