-1 + 5n > -26 and 7n - 2 ≤ 12

pls help

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

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 axis of symmetry of the function f(x)=-(x+ 9)(x-21)