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1. What angle does the tangent to the curve y=x^4-x^3+7x make with the positive direction of the x-axis at the point where x=2 y = x4 - x3 + 7x y' = 4x3 - 3x2 + 7x = x(4x2 - 3x + 7) Wait, before I continue, are you sure you have the signs right? Because it appears we need the...

I agree that it's not worth losing a friendship. But in many cases, your friend wouldn't have a problem with it. So that's fine, isn't it?

Judging by your spelling, not a chance in the world.

Best to be awake, really. Get enough sleep so you don't fall asleep while studying. With formulae or equations, try writing them a number of times. Be bothered to dig deeper and find reason behind concepts - it would be easier to remember something you understand than an empty rule.

Oh how simple it sounds now. :p Thank you.

You shouldn't have too much trouble. Chemistry is just a little worrying. :p Your ranks are quite high, you should be fine in getting 85+.

Haha, English is the daily struggle for me. I guess we all have our weaknesses. Sure, I'd rather be doing a million other things that what I do now everyday. But there's only a month or so to go, and wouldn't it be a lot better to celebrate, knowing you tried your best, than to dread your...

Nobody is naturally dumb. You just need to push yourself a bit harder if you think you're not achieving what you should be. :) Your marks aren't bad. I'd say you won't have too much trouble getting 70+. Revise well and don't panic.

5C1 x 6C1 = 30 I don't know, it seems right. Maybe the textbook made a mistake?

Ich sehe vielleicht zweimal oder dreimal pro Woche fern. Jetzt muss ich viel lernen, deshalb kann ich mich es nicht leisten, zu viel Zeit zu verschwenden. Trotzdem muss ich einige Fernsehsendungen sehen. :p Ich liebe House - es ist meine Lieblingssendung. Ich sehe auch Die Simpsons und Monk...

Well, the whole thing is sanitising water. Adding chlorine kills microorganisms such as Giardia and Cryptosporidium.

Taken from this thread, look at my other post as well. Hope it helps.

Information, of course. You can download the actual syllabus from Board of Studies yourself.

Everyone uses the CC guy. :p Just make one up, state his branch of chemistry, and what concept he uses. For example, an analytical chemist who works at Chemicon, who uses gas-liquid chromatography. :p *Shrugs* Note: If unsure, stick to Burkham.

Ich lebe, um leckeres Essen zu essen. :p Du? Findest du es wichtig, ein Handy zu haben?

You can't remember equations or formulae off a list. That would be too brain-racking and a little stupid. :p You need to study module by module, and actually grasp the concepts instead of memorising empty rules. A few important equations include combustion equations, metal + acid, acid +...

PQRS is a cyclic quadrilateral and A is any point on PQ. A circle through the points P, A and R cuts RS produced at B. Prove that BA || SQ Graph attached.

Hallo, Monica! :) Nein, ich glaube nicht an Gott. Das ist schwer. :( Was willst du jetzt essen? :p

Too true. Aside from eating, sleeping and the occasional sitting-around-doing-pretty-much-nothing, I study all the time. It's not very hard. I just work through past papers and for most of my subjects, it's quite fun.

There really aren't that many. Ethanol is produced from glucose, which was made via photosynthesis from carbon dioxide and water. When ethanol is burned as a fuel, the products are also carbon dioxide and water, which means that ethanol does not produce other pollutants such as carbon and...