Which algebraic expression represent forty times a number A 40 +n B 40n C n - 40 D 40/n

9/10 divide by -3/15 as a mixed number

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?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m