please show how to calculate on a financial calulator

Question 5.Linville Corporation issued 15-year, par $1,000 bonds ten years ago at a coupon rate of 5 percent. The bonds make semi-annual payments. If these bonds currently sell for 90 percent of par value, what is its yield to maturity (YTM)? Question 6. Pecos Company has just issued a 10-year, 10 percent coupon rate, $1,000- par bond that pays interest semiannually. Three years later, if the going rate of interest on the bond falls to 8 percent, what is the value of the bond? Ouestion 7. Karen just bought a 10-year, 5% coupon bond with $1,000 par for $825, If she sells this bond four years later for $950, what is her realized yield in year 4 (with semi-annual interests)