What are a few significant issues that are left unsolved at the end of the play Macbeth?I need to know 2-3, which need to be important if peace is...

In the final scene of Macbeth,
Malcolm addresses the people of Scotland after he has claimed his rightful
place as the next king.  Malcolm tells the people that they must send word to all the
people who fled Macbeth's tyranny and invite them back to Scotland.  Then Malcolm says
that he and the Thanes (who have been named earls) must find all the people who helped
Macbeth and Lady Macbeth carry out their murderous plans.  Malcolm and the others still
do not know whether or not Macbeth and his wife acted alone, but they suspect that
Macbeth had help in carrying out so many murders.  Malcolm says that when these two
things are settled, then Scotland can look forward to a time of
peace.