HELP PLEASE! QUICK AND EASY POINTS! USE THE IMAGE PROVIDED!!

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

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?

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.