Answer:
1 : 2000000
Step-by-step explanation:
we have to convert 20km into cm so
20km×100000
=2000000
So ratio is 1:2000000
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Answer:
It doubled up is what you could say
 
        
             
        
        
        
Y=-5x-2 
-2= y-intercept
-5x= slope
find y-intercept on a graph, make a dot.
then use slope from y-intercept dot, make another dot.
Draw line.
Is it a positive or Negative slope?
Hope that helps.
        
             
        
        
        
Answer:
c. you reject a null hypothesis that is true
Step-by-step explanation:
We need to remember the following concepts 
Error type I: Is an error associated to the probability of reject a null  hypothesis when it is actually true
Error type II: Is an error associated of not rejecting a null  hypothesis when the alternative hypothesis is the true
And the best answer for this case would be:
c. you reject a null hypothesis that is true