Help with Questions to Macbeth : Act III, Scene 5 and Act III, Scene 6

Act III, Scene 5

1. Who is Hecate, and why is she angry?
2.  What is her plan for Macbeth?

Act III, Scene 6

1. Lennox may be said to be extremely careful in his speech. Why is he so cautious in what he says? What, if anything, could be interpreted as a criticism of Macbeth?
2. Where has Macbeth gone? Why?