Macbeth hires assassins to murder them.
Who are Banquo and Fleance?
Macbeth reacts in this way to seeing the ghost at the banquet.
What is he becomes upset, angry, agitated, and erratic?
Or.. Just plain crazy?
When Macbeth first meets with the murders, this is how many murders there are.
What is 2?
Macbeth is afraid of the Banquo because according to the witches' prophecy, this is what was going to happen.
What Banquo's sons would inherit the throne?
Macbeth is preparing for war for this reason.
What is Macduff and Malcom are preparing to go to war with him
The reason Macbeth gives the murderers to kill Banquo is this.
What is Banquo treated the murderers and their families mercilessly / cruelly / badly?
When Macbeth hints at his plan to commit murder, his wife, Lady Macbeth, reacts in this way.
What is she is concerned and does not want him to commit more murder?
Macbeth asking Lady Macbeth, "Can such things be / And overcome us like a summer's cloud, / Without our special wonder? You make me strange / Even to the disposition that I owe." implies this.
What is that Banquo's ghost is visible to Lady Macbeth and everyone else at the banquet?
"There the grown serpent lies. The worm that's fled / Hath nature that in time will venom breed; / No teeth for th' present" means this in simple terms.
What is that Fleance will grow up to be Macbeth's enemy, and will try to get revenge for his father's murder?
The fact that Banquo's ghost sits on Macbeth's chair represents or symbolizes this.
What is that Banquo's descendants will inherit Macbeth's throne?