Determine which relation is a function.

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

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?

2.5 milligrams is equivalent to how many grams