Can you explain it with the formulas? Thank you

27) what is he present value of annuity $4000 received at the beginning of each year for the next 8 years? The first payment will be received today, and the discount rate is 8%? Q1) what will be the future value of $100 in 2 years at interest rate of 5% Q8) How much you must pay into an account at the end of each 20 years in order to have $100,000 at the end of the 20th year? Assume the account will pay 6% per year. Q2) what will be $500 deposited in the bank every year for 5 years at 8% be worth? Q9) if you put $10,000 in an investment that returns 11% compounded monthly what would you have after 10 years? Q3) what is the Present value of $15500 to be received 12 years from now assume a discount rate of 7.5% Q4) how much money must be paid into a bank account yielding 3.5% in order to have 1200$ at the end of year 10? Q10) your son will be attending an expensive university in 12 years, you deposited $5000 per year for 12 years, beginning today how much money will be in the college fund 12 years from now if the fund earns 8% per year. Q5) Ali deposited $1000 in a bank account and 8 years later she closed the bank account which is worth $2000 what annual rate of interest has she earned over the 8 years? Q6) At what rate must $500 be compounded annually for it to grow $1079.46 in 10 years