What are two partial products you could add to find 990 x 37 ?

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

Solve the equation - 2(m -30) = -6m a-15 b-13 c-8 d8

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?