Pls help me with this

Which expressions are equivalent to -6 + 3m

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?

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex