There is one more value of x between 2 and 3, multiplied by 5, so 5 is the net change between the two variables.
        
             
        
        
        
Answer:
A - 8:1
Step-by-step explanation:
2/5:1/20
cross multiply 
40:5
8:1
 
        
             
        
        
        
3.5 kg:800g
3500g:800g
35g:8g
        
             
        
        
        
Answer:
a) 
b) 6.84 million
c) 2028.52
d) 47 years
Step-by-step explanation:
a)Here we know standard exponential growth rate is
 
In this put t=0 and a(t)=6.27 million
thus we get a = 6.27 million
 now 
   this is equal to(in 2012)=
b)Put t = 6 
 we get
 
=6.84 million
c) 
   take log both sides
 we get 16.52 years
d) 
take log both sides we get 47 years to get double the current population.
 
        
             
        
        
        
The sides could be 1,14 or 2,7