Help quick please help hep

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

Which expression is equivalent to 3^3 + 2^2?

How can you tell when x and y are not directly proportional?