Which store has the best deal

Abank gives 6.5% interest per year. what is the growth factor b in this situation?

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)