One-third of a number is 12 work out one-half of the number

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

What is x3+3x2−16x−48 divided by x−1?

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?