I really need help with these if anyone could help I’d be very grateful I just need to learn how to do them so I can do the rest. You can answer how many of them you would like. Please tell me how to do them as well though.

When can u say there is no solution for a system of linear inequalities? explain your answer and show with a system and graph

Cherie measures and records the lengths and sizes of the same style of a sandal found at a shoe store. which equation can be used to determine the approximate shoe size, s, for a foot length of x inches? s = x – 2 s = 2x – 10 s = x + 6 s = 2x + 4

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?