If f(x)=1/5x+9, which statement is always true?
(1) f(x)<0
(2) if x<0, then f(x)<0
(3) f(x)>0
(4) if x>0, then f(x)>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?