Solve the system of equations. 2x + 2y+ 3z = 9
2x + y + 5z = 7
5x + 2y + 4z = 9

Pls help!!

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?

Which question is not a good survey question? a.don't you agree that the financial crisis is essentially over? 63on average, how many hours do you sleep per day? c. what is your opinion of educational funding this year? d.are you happy with the availability of electronic products in your state?

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom