Respuesta :

(4x+4) = (6x-14)

So after you factor >> the answer is 9

So the answer is a,9
Hope this helps. 
GossipTwin
When dealing with parallelograms opposite sides are congruent.
 4x+4=6x-14
You will isolate the variable leaving you with x=9
Then you plug X back into one of you angles, such as, 4x+4
equaling to your angle being 40 degrees.
Answer: C) 40 degrees

Hope it helps!