Find all solutions to the equation in the interval [0, 2pi] sin2x-sin4x=0

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

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?