# I’m not sure how to do this please help!

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Answer:sum of the interior angles x and y gives the exterior angle z(4n-18)°+(n+8)°=(133-6n)°4n°-18°+n°+8°=133°-6n°4n°+n°-18°+8°=133°-6n°5n°-10°=133°-6n°5n°+6n°=133°+10°11n°=143°11°n/11°=143°/11°n=13exterior angle=133-6×13 =133-78 =55

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