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[O is the centre] AOC = 2.ADC (angle at centre is twice angle at circumference) ADC + ABC = 180 (cyclic quad) ABC + CBP = 180 2.CBP = 2.ADC = AOC *and for b) it's just cointerior angles on parallel lines

we've done precipitates and a bit of other solubility stuff. I dunno if that's part of water though. we also did a bit on the structure and formula of eth/meth- etc -ane/ene/yne though not much (I think that's in energy)

ABC is 3^2=9 times bigger than ADE, since they are similar and AC is three times bigger than AE. Similarly EFC is 4 times bigger than ADE, so BDEF is 9-4-1=4 times bigger.

you want to find 2*n + -1*(8-n) = 1 3n = 9 n = 3 ie you wan the coefficient of the 3rd term edit: stuffed that. you want the term n from the end - there are 9 terms so you want the 6th term

we havent even started water or energy in chem. havent done polynomials, parabola, parametric representation, calculus, perm/comb in maths/ext

picking up mx2 and dropping to 10 units

number of hours = distance/velocity = 3000/v .'.fueld used = (50 + 10-6v3)*(3000/v) = 150000/v + (3v^2)/1000 b) A' = -1.5*10^5 v^-2 + 6*10^-3 v = 0 v^3 = 2.5*10^7 This is a minimum for A as A->infinite as v->0 or infinite Then just calculate values for v and A.

edit: you can still do it by multiplying the (x-1)(x-4) by a^2, it just takes more time than solving simultaneously straight away

actually come to think of it shaon0's method was best anyway

or, 2/4 chance of being next to a parent, 1/2 chance of this being their parent

I'd still say it's quicker to just expand both sides and equate coefficients

[t = tanx, c = cosx] if you rearrange to find tanb, you get tanb = t/(4+3t^2) now multiply top and bottom by 2c^2 2sc/(8c^2+6s^2) = sin2x/(2c^2 + 6(c^2+s^2)) where c^2 + s^2 = 1 and 2c^2 = cos2x + 1 = sin2x/(cos2x + 7)

and what a fine post it is

just expand and equate coefficients

nah I don't go to SBHS. I was finding maths quite interesting initially when we did inequalities, absolute values and trig which I was largely unfamiliar with, but when we started geometry and stuff.. it got boring very quickly.

Re: 回复: Re: 回复: Re: 回复: Re: What UAI are you aiming for? yeah I'm not sure whether I want to try get into BSc (Advanced Mathematics) or Bsc (Advanced). What are the main differences between them + do you know the difference between different universities (Macquarie, USYD, maybe UNSW) for the...

I would probably say physics is the most interesting now. I swear I learnt next to nothing all term with chemistry and math/ext so they're taken way down.

Re: What UAI are you aiming for? I want to do Bachelor of Science (Advanced Mathematics), so 95.95 for macquarie, or 98.85 (I really doubt that I'll get that) for sydney. I'd be fairly happy with 90+ though.

I'm still a bit lost as to why you can't just do the "0.2 x 0.8 x 0.2 x 0.8 x 0.2 x 0.8 = 64/15625", or what "6C3-(5C1x3C1x1C1)=5" means.

a) 4!3!2! = 288 b)2/4*1/2 = 1/4 is this really mx2? it seems easy even for mx1 (assuming I'm correct)