Help please I need answer ASAP

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

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

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?