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    STAT after UAC application

    Hi! I just want to ask what if I did my STAT after my UAC application and didn't attach the STAT number to UAC back then? I thought that we could still attach it ourselves after we applied for STAT, but I couldn't find that section which allows us to. What do I do now? I still have to attach...
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    Calculation questions

    Please help!! :) The concentration of oxygen in tropospheric air is 20.94% v/v. A 20L sample of air is collected at 101.2kPa and 298K. a) calculate the concentration of oxygen present in the air sample in parts per million. b) determine the volume of pure oxygen gas that could be...
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    further calculus

    this is a very easy question, but i still need help -.- can anyone show me how to show: d [tan^-1 (cot x)] / dx = -1 i just learnt this, and my concepts still aren't that clear. thanks for your help!
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    Math question, please help :)

    Can anyone please tell me how to do it? I took lim... but somehow I just couldn't get the answer :S The blurry bit says at end of question a) lim(h->0) log (1 + h/x)^(1/h) thank you so much.
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    Integration

    Please help me, it's pretty urgent. Thanks a lot.
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