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Just got my exam timetable. A couple days off, but English and 3U maths on the same day :(.

Re: HSC 2015 3U Marathon But what is the equation of the locus?

Re: HSC 2015 3U Marathon Tangents are drawn from the ends of a focal chord on the parabola x^2=4ay at points P(2ap, ap^2) and Q(2aq, aq^2). Find the locus of the intersection of these tangents.

800-900 words. I mean you have to write it in 40 minutes, usually.

Thank you! I would complete the square! x^2+y^2-2ay=0\\x^2+y^2-2ay+a^2=a^2\\x^2+(y-a)^2=a^2 I guess I better post another question, though I can't be bothered finding one, so I'm making this up on the fly. I believe it is possible. PHYSICS: A car travelling at 40km/h west collides with a van...

It's getting late, I'm just going to dump my working, tell me if I got close. P(2at,at^2)\,\,\,\,\,S(0,a)\,\,\,\,\,t^2:1\\\text{By the division into ratios...

Yeah an acid plus a carbonate always gives salt, water and carbon dioxide. DatAtarLyfe, I'm working on your question. I can get the first two parts out, but the last one is giving me trouble.

OP, if you want to find the sig figs, convert it to scientific notation and the amount of digits infront is your sig figs.

Trolololol You're trolling us.

That is correct! Next question! (chemistry again): Identify the missing products, then balance the equation: MgCO_3+HCl\to MgCl_2+X+Y

Power loss can be mitigated through the use of AC transformers. Transformers can decrease the current while increasing the potential difference to keep power constant (V=IR). Less current means less energy lost in heat which means a decrease in power loss. When higher currents are needed closer...

Re: HSC 2015 3U Marathon \text{LHS= }(x_1-x_2)^2\\=x_1\!^2-2x_1x_2+x_2\!^2\\=x_1\!^2+2x_1x_2+x_2\!^2-4x_1x_2\\(x_1+x_2)^2+4x_1x_2\text{ =RHS}

I actually converted my name in base 36 to base 10, and it ended up being a pretty cool set of numbers. Maybe try some base conversions on your name or another word? It's cool having people try to guess what is is.

Don't put yourself down like that WLL...

WrittenLoveLetters? How were your trials?

Does anyone have any engineering studies preliminary yearly past papers? I can only seem to get my hands on a few.

y=2x^3-3x^2+5\\\text{Let }m=x^2\\y=2m^{\frac{3}{2}}-3m+5 Now what?

Except for the fact it isn't a quadratic.

I have mostly awesome teachers. My maths teacher is great at finding ways to explain concepts. My physics teacher inspires me to think deeper about the world itself. My chemistry teacher teaches us everything we need to know, and teaches it well. My english teacher is extremely passionate about...

oh baby.... harder....