+0  
 
0
84
1
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I really need this

 

 Jul 18, 2020
 #1
avatar+28021 
+1

Over a distance of 2    (from 1 to 3)

   the graph changes from -2  to 4    a change of 6

      average = 6/2 = 3 per unit

 Jul 18, 2020

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