What is interest rate risk? What are the roles of a bonds coupon and maturity in determining its level of interest rate risk?

What is the difference between a bonds promised yield and its realized yield? Which is more relevant? When we calculate a bonds yield to maturity, which of these are we calculating?

Rolling Company bonds have a coupon rate of 3.5 percent, 13 years to maturity, and a current price of $1,052.60 What is the YTM? The current yield?

Atlantis Fisheries has issued a zero coupon bond at a price of $410 per bond. Each bond has a face value of $1,000 at maturity in 20 years. If these zero coupon bonds are callable in 15 years at a call price of $625, what is their yield to call?