Recent content by qwerty44

  1. qwerty44

    ITT: Post Mathematics (2U) Questions/Problems

    When doing any calculus (differentiation or integration) with trig function you use radians. Because degrees are not a linear measurement.
  2. qwerty44

    Series and Sequences - Sum of a series

    Use simultaneous equations with variable a and d. Then when you solve for a and d just find the sum when n=20 i.e. a+5d=23 a=23-5d (1) 10/2(2a+9d)=210 (2) sub (1) in (2) Solve.
  3. qwerty44

    How big is the observable universe? Find out here....

    haha don't thank me, thank the guys who made it. It will keep you occupied for a while too :D
  4. qwerty44

    How big is the observable universe? Find out here....

    Also make sure you click on things as it gives you some information.
  5. qwerty44

    How big is the observable universe? Find out here....

    You will make no mistake in clicking this link, as it is quite interesting even for non-physicist: http://htwins.net/scale2/
  6. qwerty44

    2012 Year 9 &10 Mathematics Marathon

    Re: 2012 Year 9 &10 Mathematics Marathon That's true. Some people read solutions and think they understand, but when you give them a similar question, they have no idea.
  7. qwerty44

    2012 Year 9 &10 Mathematics Marathon

    Re: 2012 Year 9 &10 Mathematics Marathon Good question. Also realised your source of questions :P
  8. qwerty44

    2012 Year 9 &10 Mathematics Marathon

    Re: 2012 Year 9 &10 Mathematics Marathon I'm a bit late, but yes, 5kg. :D
  9. qwerty44

    2012 Year 9 &10 Mathematics Marathon

    Re: 2012 Year 9 &10 Mathematics Marathon A mushroom farmer has sent an order of 70 kg of mushrooms to the markets in standard cases. If he had used larger cases, each capable of holding 2 kg more, he would have used 4 fewer cases. What is the capacity (in kg) of the standard case?
  10. qwerty44

    2012 Year 9 &10 Mathematics Marathon

    Re: 2012 Year 9 &10 Mathematics Marathon It's called LaTeX. http://www.codecogs.com/latex/eqneditor.php <you can try it out here To post with it on here [ TEX ] *put code in here* [ / TEX ] without any spaces in the brackets. You'll~get~used~to~it
  11. qwerty44

    2012 Year 9 &10 Mathematics Marathon

    Re: 2012 Year 9 &10 Mathematics Marathon Another thing you should keep in mind is that the side length of an equilateral triangle inscribed in a circle of radius R is R\sqrt3. This can be proved later with calculus. So in this case, R*sqrt3=1, therefore R=1/sqrt3 (0.577...) Just an...
  12. qwerty44

    2012 Year 9 &10 Mathematics Marathon

    Re: 2012 Year 9 &10 Mathematics Marathon Correct :D
  13. qwerty44

    Cool problem of the day!

    The least common multiple of positive integers a, b, c and d is equal to a + b + c + d. Prove that abcd is divisible by at least one of 3 and 5.
  14. qwerty44

    Cool problem of the day!

    I got 30 units^2. Anyone else care to try?
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