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0.10 off SAM, I got 98.70

^ I did go to the UAC site, but all they allow us to do was changing our contact details or preferences. Didn't have anything to do with attaching STAT registeration number to my application/account.

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...

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...

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!

thanks! ;)

ohhh thanks -_- damn, i feel stupid now. for question b) ... how do i answer it in a correct format? do i just say y' = lim.... = 1/x =S

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.

thank you! :) The explanations are very understandable too!

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