$1.66 x 100 = ? I can't seem to find the correct answer and I must show my work

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?

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

1/4x+5=3/4. i can't get access to the answer to this question! and, my request on "contact us" will not go