Does anyone know?? i struggle with masth alot and this one is kinda confusing

2x + 1 < 5 solve the following inequality. then place the correct number in the box provided.

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

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?