Can you help me please? I tried doing face value/ price ^ 1 but I'm getting wrong answer. not sure why. thanks in advance.

Suppose you purchase a 30 -year, zero-coupon bond with a yield to maturity of 6.3%. You hold the bond for five years before selling it. a. If the bond's yield to maturity is 6.3% when you sell it, what is the annualized rate of return of your investment? b. If the bond's yield to maturity is 7.3% when you sell it, what is the annualized rate of return of your investment? c. If the bond's yield to maturity is 5.3% when you sell it, what is the annualized rate of return of your investment? d. Even if a bond has no chance of default, is your investment risk free if you plan to sell it before it matures? Explain