Can someone please help with this algebra 2 work.

Find the value of x for which abcd must be a parallelogram -9-6x x-30

16 more than the product of 5 and p

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?