Verified Answer :

jhonyy9

use proportionalitie of sides so because this line with length 2x-8 is a midle segment line what mean that 

2x-8      1
------- = ---  => 2x -8 = 10 so 2x = 18 so x = 18/2 so x = 9 
  20       2

and so choice C. is right sure

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