... do ah ". Kay, drama horh. Lol. Yeap, I did 13b, and thn I know how to do 13a alrdy. Went to stare at my Q12 workings [back part] for 15minutes to check for errors, and thn Im left with 2mintues and decided to go to th front part of Q12, and I saw th wrong sign yknow. Like wtheck, tried to change, but no time x.x   . And Cc marking our MYE chem papers in th hall just distracts me ;P...