I have tried solving it, but got it wrong

I have solved the second one!

You have just purchased a municipal bond with a $10,000 par value for $9,500. You purchased it immediately after the previous owner received a semiannual interest payment. The bond rate is 6.6% per year payable semiannually. You plan to hold the bond for 4 years, selling the bond immediately after you receive the interest payment. If your desired nominal yield is 7% per year compounded semiannually, what will be your minimum selling price for the bond? $ 9713 Carry all interim calculations to 5 decimal places and then round your final answer to the nearest dollar. The tolerance is 05. Charlie has $10,000 to invest for a period of 5 years. The following three alternatives are available to him: Account 1 pays 2.00% for year 1, 4.00% for year 2,6.00% for year 3, 8.00% for year 4, and 11.00% for year 5, all with annual compounding. Account 2 pays 11.00% for year 1,8.00% for year 2, 6.00% for year 3,4.00% for year 4, and 2.00% for year 5, all with annual compounding. Account 3 pays interest at the rate of 6.15421% per year for all 5 years. Based on the available balance at the end of year 5, which alternative is Charlie's best choice? Year 5 Balance, Alternative 1: $ Year 5 Balance, Alternative 2: $ Year 5 Balance, Alternative 3: $ Carry all interim calculations to 5 decimal places and then round your final answer to the nearest dollar. The tolerance is 05