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If you're an English/humanities based person, why are you doing Extension 1 Maths?

So I was actually in quite a remarkably similar situation to you. I do basically the same subjects as you (3U Maths, Physics, Chemistry, Engineering Studies, Business Studies, and Advanced English). I was in the top of most of my classes throughout year 10 (excluding english) and I'm...

Don't be scared about 13 units. It's a lot easier to do 13 units in preliminary than it is in HSC. I do 13 units and I have no trouble with it at all.

Some schools do half-yearly testing at the end of term 1. I think it's pretty cool, you only need to study for one term's worth of content. I'm feeling pretty happy about year 11. I am worried though, I am very ambitious in my school grades, and I do fairly well except for english. I need to...

Here's my solution. Basically I calculated the angle the bigger angle marked \phi and subtracted the angle \psi from it to get angle \theta. http://i.imgur.com/uQNUs4e.jpg EDIT: Aaannnnddd.... I just realised I incorrectly rounded my last answer. Please ignore that mistake, the method is still...

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread There does exist other suitable quadratics though, right? I came up with y=-\frac{9}{4}(x-5)(x-1).

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread I have a method to solve 8A 7d, but it's hardly ideal. I haven't studied that chapter so I recommend asking a teacher. As for 7J 4a, the graph is not differentiable at a point where there is a sharp turn. This is because there...

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Seeing as the problem doesn't give a domain, and the functions go on forever, we need to represent the answer as a general solution because there is going to be infinitely many possible solutions. These fractions will have zeros...

Just imagine this in your mind: You have 100% of UV rays coming from the sun before they even touch the cloths. Each SC50 cloth just removes half the amount of UV rays directly above it. So the first cloth will remove 50% of the original 100%, allowing 50% to pass through. The second cloth will...

I have the most faith in mathematics 3U. I really enjoy every single one of those classes, which is saying a lot because apparently maths is hard to enjoy.

Thanks guys. I didn't realise that identity existed. I guess it's just a combination of the pythagorean identity and the double angle cosine identity.

I know, MIF is shit, use cambridge yada yada yada... Get over yourself. Sums and Differences of Angles $Simplify: $2cos^23\alpha-1 If anyone can guide me in solving this problem, I'd appreciate it.

Re: HSC 2015 2U Marathon What? I can only think of one possible circle which is tangent to all three lines and in the first quadrant...

Your working out is right, but sin^{-1}\left(\frac{81}{135}\right) is definitely equal to 36^{\circ}52'.

Here's something to back you up. It's a reactivity series. Sodium is so reactive that it will react with water, which means it wont make a good water tank.

Fix that. You're not going to get anywhere with that.

Re: HSC 2015 2U Marathon In the following answer, please pretend that the negative square root of two is actually positive on the second to last line of working. For some reason, if I remove the negative, LaTeX screws up. If anyone knows why, let me know. \text{A function is at a minimum...

And what did you get in 3U?

I believe it is possible. David is SW of the tower then travels east and becomes SE of the tower.

I know, M.I.F. is shit, yada yada yada, get over yourselves. I'm forced to use it. Does anyone know how to answer the question 8 of 6.14? "David walks along a straight road. At one point he notices a tower on a bearing of 053 degrees, with an angle of elevation of 21 degrees. After David...