I need help writing an expression​

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 radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

Write the factored form of this trinomial 9x^2+18x-7