can you help me with question 5 ?

Question 5. Linville Corporation issued 12-year, par $1,000 bonds ten years ago at a coupon rate of 7 percent. The bonds make semi-annual payments. If these bonds currently sell for 95 percent of par value, what is its yield to maturity (YTM)? Question 6. Pecos Company has just issued a 10-year, 8 percent coupon rate, $1,000 par bond that pays interest semiannually. Four years later, if the going rate of interest on the bond falls to 6 percent, what is the value of the bond? Question 7. Karen just bought a 10-year, 6% coupon bond with $1,000 par for $805. If she sells this bond two years later for $920, what is her realized yield in year 3 (with semi-annual interests)