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  1. addikaye03

    Mathematics Marathon HSC 09

    P=$150,000, I=0.075/12=1/160 (monthly interest), n=120 monthly repayments i) A_1=P+I-M =150000+150000(1/160)-M =150000(1+1/160)-M A_2=A1+A1(I)-M =A1(1+1/160)-M =[150000(1+1/160)-M](1+1/160)-M =150000(1+1/160)^2-M(1+1/160)-M =150000(1+1/160)^2-M[1+(1+1/160)]...
  2. addikaye03

    I might come down to Melb soon and check out st hilda's actually, i've heard good things. Btw...

    I might come down to Melb soon and check out st hilda's actually, i've heard good things. Btw, how did you go with O-week? Did they let you live on the college during O-week? because i heard that you can only be admitted to college 3 days before uni commencement (march 1st). Do they let you go...
  3. addikaye03

    Mathematics Marathon HSC 09

    lol now that's just silly khorne
  4. addikaye03

    Mathematics Marathon HSC 09

    correct That's not correct, try counting the in two terms succession and you might see a pattern, the Q is really simple if you see it
  5. addikaye03

    Mathematics Extension 1 Marathon HSC 09

    New question: Find the values of r and n if in the expansion (1+x)^n in ascending powers of x, the (r+1)-th coefficient is twice the r-th and (r+10)-th coefficient is twice the (r+11)-th. What is the greatest coefficient in this expansion?
  6. addikaye03

    Mathematics Marathon HSC 09

    New Question: Find the sum to n terms of the series a) 1+5+9+... b) 3+7+11+... Hence or otherwise, find the sum of the series 1-3+5-7+9-11+.... to i)100 terms ii)101 terms
  7. addikaye03

    A locus problem.

    m(AP)=2m(BP) [The m just stands for gradient] Using m=(y2-y1)/(x2-x1) m(AP)=y/(x-a) m(GP)=y/x+a y/(x-a)=2y/(x+a) [Since m(AP)=2m(BP)] y(x+a)=2y(x-a) yx+ya=2yx-2ya yx=3ya x=3a, As required
  8. addikaye03

    That's really awesome dude, i really really love the university, cannot wait to commence. I...

    That's really awesome dude, i really really love the university, cannot wait to commence. I think my first preference will be University College. I've only been to Queens, Ormond, Trinity and University Collegem and just like the atmosphere of it more than the others. Which College are you at?
  9. addikaye03

    Mathematics Marathon HSC 09

    Or maybe 2Re(z)+3Im(z)=4, converted it to 2U form, thus i retract my previous statement haha
  10. addikaye03

    Mathematics Marathon HSC 09

    It's easy but it's still 4U, this is a 2U thread if i'm not wrong
  11. addikaye03

    Mathematics Marathon HSC 09

    The question is when you have the gradient of the tangent to the curve and a point, hence to find an expression for f(x) you just integrate and find C. Should be right
  12. addikaye03

    Mathematics Marathon HSC 09

    equal roots means a double root so discriminant is=0 ∆=b^2-4ac=0 (k^2-2k+1)+4(2k+1)=0 k^2+6k+5=0 Factors: 5,1 (k+5)(k+1)=0 Hence k=-5 or k=-1
  13. addikaye03

    Mathematics Marathon HSC 09

    d/dx[(1+sinx)^5]=5(1+sinx)^4 x(cosx) =5cosx(1+sinx)^4 Question(Harder 2u): Using the fact that: (a-b)^2>=0 where a>b show that a^2+b^2+c^2>= ab+ac+cb
  14. addikaye03

    Mathematics Marathon HSC 09

    f'(x)=3x^2-2 f(x)=x^3-2x+C Sub in point (1,3) 3=1-2+C therefore C=4 f(x)=x^3-2x+4 Question: Factorise x^4-1
  15. addikaye03

    1978 2unit hsc

    Papers 2000 and 2003 are probably the hardest in my opinion. Specifically the 10b from 2000, and the last two questions from 2003 are much harder than sourrounding years. 2004, 05, 06 and 07 have interesting Q 10's but they aren't relatively hard, just require intuitive thought.
  16. addikaye03

    Aww right, so moved down there for uni? what course and uni? and ahh right, not that far from...

    Aww right, so moved down there for uni? what course and uni? and ahh right, not that far from albury at all. You liking it in the city? i'm going to uni of melb next year for BEngineering. Staying on college first year at least so that should be awesome!
  17. addikaye03

    Number of times failed on your P's test?

    Got mine first time in a manual The most fails i've ever heard of was a friend of mine who told us he failed 4 times, then one night we were talking to his mum whilst he wasn't there and she let it slip that he actually failed 9 times!!!!!
  18. addikaye03

    Concavity..?

    Concave up- f''(x)>0 Concave down- f''(x)<0
  19. addikaye03

    exact value of tan10

    All values are in degrees: tan80=tan(60+20) =(tan60+tan20)/(1-tan60tan20) =[√3+(2tan10/1-tan^2(10)]/(1-√3tan20) Simplify gives: [√3tan^2(10)-2tan(10)-√3]/[tan^2(10)+2√3tan(10)-1] Since tan80=1/tan10 therefore tan10=[tan^2(10)+2√3tan(10)-1]/[√3tan^2(10)-2tan(10)-√3] Alternatively...
  20. addikaye03

    Pen spinning?

    Haha yer i used to just unconsciously spin my pen in class, people would just be looking at me and i didn't realise why then later i would haha I can't help it now, whenever i got a pen in my hand and thinking or not using it i spin it lol I can do all the basics perfectly, around the thumb...
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