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  1. perpetuallystressed

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w11_qp_43.pdf I need help in 3(e)(iv)! I don't know how to get [CH3CO2Na] & [CH3CO2H].
  2. perpetuallystressed

    Mathematics: Post your doubts here!

    Paper wasn't that easy... I'm worried sick. I practiced so hard for Math, was aiming for an A*... :(
  3. perpetuallystressed

    Mathematics: Post your doubts here!

    lg10 (x+9)-lg10 (x) = 2 lg10 ((x+9)/x) = 2 x+9/x = 10^2 x+9 = 100x x= 1/11 I have my P3 exam too...good luck!
  4. perpetuallystressed

    Mathematics: Post your doubts here!

    |w-w^2| is the diameter. So |-1+i-(-2i)| = (10)^0.5, and radius is 1/2 x (10)^0.5
  5. perpetuallystressed

    Mathematics: Post your doubts here!

    Need help! :-( http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_33.pdf Q.6 (ii). I know how to get the radius but I can't figure out how to get the center of the circle?
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