I need help answering these 3! Also if you could explain how to enter these into an HP 10b financial calculator, that would be great!

Problem 4-48 Calculating Present Values A 4-year annuity of eight $11,400 semiannual payments will begin 7 years from now, with the first payment coming 7.5 years from now. a. If the discount rate is 11 percent compounded monthly, what is the value of this annuity five years from now? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) b. If the discount rate is 11 percent compounded monthly, what is the value three years from now? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) c. If the discount rate is 11 percent compounded monthly, what is the current value of the annuity? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) a. Value of the annuity b. Value of the annuity c. Value of the annuity