1. when the constitution was first proposed, there were three dissenters. who were they and why did they refuse to sign the document?
2. what right does the third amendment protect?
3. what does the ninth amendment say?
4. does the bill of rights apply to students? if so, to what extent?

1. George Mason, Edmund Randolf, and Elbridge Gerry, I believe 
2. "No soldier in time of peace or war be quartered in any house with out the consent of the owner"

4. The State can't hold minors against their will, unless they have committed a crime, but requires them to go to an institution all day (school) where they can be held.

I hope this helps. I don't know #3 sorry

Alloy of metals is the answer