A flashback is when something is remembered from the past. And a flash forward is when you like make a video go to like the next seen or something like that.
Sure!
One reason may be that persons younger than 18 will not always make responsible decisions, so entrusting them with electing officials might not be prudent.
A person younger than 18 might not vote for themselves, to reflect their own beliefs, but they might be influenced or even pushed to vote for a representative or measure of their parents' choosing.
People younger than 18 generally are not educated enough about politics and policies to make smart choices when it comes to voting.
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Answer: Hecate is angry because the 3 witches have made prophecies to Macbeth without telling her.