Sean should make a notecard or a study sheet at least 2 nights prior to the test and write down the important formulas he needs to know. Cover this notecard in tape or clear plastic and take it everywhere. Sometimes, he can quiz himself on the spot, or ask friends to quiz him on his formulas. Also, writing the formulas down over and over again can help drill it into his brain.
It uses more dynamic words
I believe the answer is C. twelve
He does not want them to hear the Siren's song because then they will die.
