Please help this is geometry I need help

An angle that measures between 90 and 180° is called a(,

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?

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.