Is this an equation or a expression 45+ 2p​

Write the expression 7x^3-28xy^2 as the product of 3 factors

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?

Solve -.016x= -16. need solving this