Question 417406
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Hi
Given trapezoid ABCD with median line EF, find the value of x. 
ab= 2x+2 
ef= 17 
dc= 5x-10
 If I am understanding Your question properly:
(ab + dc)/2 = ef
 [(2x+2)+(5x-10)]/2 = 17
 [(2x+2)+(5x-10)] = 34 
     7x =  42
      x = 6