What is the quotient of 6.15 and 3

Use set builder notation to represent the following set: { -3, -2, -1, 0}

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?

20 ! brainliest ! add and simplify your answer.