Verified Answer :

olumideolawoyin

Answer:

x = 10/3

Step-by-step explanation:

80° + 110° + 110° + 18x = 360° Sum of angles in a quadrilateral

300° + 18x = 360°

18x = 360° - 300°

18x = 60°

x = 60/18

x = 10/3

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