Here's the question you clicked on:
mathprob
Line JK bisects line MN at point j. Find MN if JM= 6 3/4 feet?
|dw:1316035534514:dw| Since JK bisects MN.. that means that jM is the same length as jN. Therefore, just double jM and you have your answer. MN = 13.5 feet. Make sense?