The only thing I dont understand is what is use expression 6.2 means. I underlined in the question. How is the expression looks like?

Problem 6-25 Suppose you purchase a 30-year, zero-coupon bond with a yield to maturity of 6%. You hold the bond for five years before selling it. Note: assume $100 face value Complete the steps below using cell references to given data or previous calculations. In some cases, a simple cell reference is all you need. To copy/paste a formula across a row or down a column, an absolute cell reference or a mixed cell reference may be preferred. If a specific Excel function is to be used, the directions will specify the use of that function. Do not type in numerical data into a cell or function. Instead, make a reference to the cell in which the data is found. Make your computations only in the blue cells highlighted below. In all cases, unless otherwise directed, use the earliest appearance of the data in your formulas, usually the Given Data sectioin If the bond's yield to maturity is 690 when you sell it, what is the annualized rate of return of your investment? If the bond's yield to maturity is 7% when you sell it, what is the annualized rate of return of your investment? If the bond's yield to maturity is 5% when you sell it, what is the annualized rate of return of your investment? Even if a bond has no chance of default, is your investment risk free if you plan to sell it before it matures? Explain Maturity (years) Face value Yield to maturitv Holding period (years) 30 100 600 If the bond's yield to maturity is 690 when you sell it, what is the annualized rate of return of your investment? Requirements 1 In cell D17, by using cell references, calculate the purchase price of the bond (1 pt.). Note: The output of the expression or function you typed in this cell is expected as a positive number 2 In cell D18, by using cell references, calculate the number of periods remaining until maturity (1 pt.) 3 In cell D19, by using cell references, calculate the price of the bond when sold (under YTM 1) (1 pt.). Note: The 4In cell D20, by using cell references, calculate the rate of return on the investment (1 pt.). Note: Use an expression 5 In cell D26, by using cell references, calculate the price of the bond when sold (under YTM 2) (1 pt.). Note: The 6 In cell D27, by using cell references, calculate the rate of return on the investment (1 pt.). Note: Use an expression 7In cell D33, by using cell references, calculate the price of the bond when sold (under YTM 3) (1 pt.). Note: The 8 In cell D34, by using cell references, calculate the rate of return on the investment (1 pt.). Note: Use an expression output of the expression or function you typed in this cell is expected as a positive number. similar to Equation (6.2) to compute the rate of retun output of the expression or function you typed in this cell is expected as a positive number. similar to Equation (6.2) to compute the rate of retun output of the expression or function you typed in this cell is expected as a positive number. similar to Equation (6.2) to compute the rate of retun In cell F38, type either coupon rate or YTM as the main risk factor when selling a bond before maturity (1 pt.) 9 17.41 25 23.30 6.00% Purchase price Maturity when sold (years) Bond price when sold Rate of return b. If the bond's yield to maturity is 7% when you sell it, what is the annualized rate of return of your investment? 7% Yield to maturity Bond price when sold Rate of return 18.42 1.14% If the bond's yield to maturity is 5% when you sell it, what is the annualized rate of return of your investment? 500 Yield to maturity Bond price when sold Rate of return 29.53 11.14% d. Even if a bond has no chance of default, is your investment risk free if you plan to sell it before it matures? Explairn If you sell prior to maturity, you are exposed to the risk that the may change YTM