Find x and then find the measure of the exterior angle

Fast phone couldn’t copy and paste so i decided to right it down

Through non-collinear points there is exactly one plane.

Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?