For what natural values of n is (2--27) positive?

Given the graph below state whether or not the relation is a function, and give the domain and range.

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done

Describe a situation that you could represent with the inequality x< 17