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I wrote something like: they kill the micro organisms that spoil the food and used as antioxidants to prevent the oxidation of oils which helps preserve the food. Don't think I described it though :/

I'd say around 96 atm.

re: HSC Chemistry Marathon Archive 1. Nitrates can be tested for using the brown ring test, where iron sulfate is added to the water sample inside a test tube, then sulfuric acid is slowly added. If a brown ring forms, then nitrates are present. Phosphates - ammonium molybdate test, where you...

oh yeah that's true in that sense -.- I can't really see how I can improve THAT much in English though. I kinda meant: do you think it's better to improve a few marks in English or a few marks in my other subjects? sorry about the confusion :/

Thanks! what subject(s) do you think I should be focusing more on in externals for 99+?

school rank is ~80 Adv English: 19/63 Math ext 1: 1/44 Math ext 2: 3/19 Chemistry: 1/50 Physics: 1/63 thanks :)

My school did the physics independent paper as well. Our teacher said that the marking guidelines were pretty poorly done for a few questions (e.g. that it doesnt deserve a 3/3 but rather a 2 or a 1) and I really have to agree there. If i recall, that slingshot question was one of them. So they...

The way I saw it was that most people would probably not focus as much after the trials, so it would've been better to finish the course before then. But it probably is a better idea to take it easy and get through the content thoroughly.

It looks like we're pretty behind. Almost half-way through mechanics and still have harder 3u and graphs to go. Definitely won't be finishing 3u course before trials and probably not 4u either :/

Re: HSC 2013 3U Marathon Thread You could consider the graph of y=\sqrt{a^2-x^2} which is just a semi-circle. y_{1}=\sqrt{a^2-b^2} \int_b^a \sqrt{a^2-x^2} \ dx=Area(sector)-Area(triangle) =\frac{1}{2}a^{2}\theta - \frac{1}{2}b\sqrt{a^{2}-b^{2}}...

I know the answer but I just can't seem to get it. Please help! Question is found in Yr 11 Cambridge Maths 3U book, Exercise 1E, Q16 (pg 12) Simplify (1+a)^2/[1+(a/(1-a+(a/(1+a+a^2)))] This is the image of the question. Any help is appreciated. Thanks