Find the area of the shape shown below:

Through non-collinear points there is exactly one plane.

Hi, can anyone show me how to do this problem? 100 points for this. in advance

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?