Idont understand

a cylinder has a circular base with a diameter of 12 ft. the height of the cylinder is 4 ft. what is the volume if the cylinder rounded to the nearest whole number use 3.14 for pi

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?