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Started from the first term and now we're here.

 Apr 24, 2019
 #1
avatar+106519 
+2

1. First five terms  =  10, 8.5, 7, 5.5, 4

We have a constant difference between terms....so...arithmetic

 

2. Already covered

 

3.I think this is what is wanted :   https://www.desmos.com/calculator/0ajkqjacqu

 

 

cool cool cool

 Apr 24, 2019

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