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  1. C

    Year 11 - functions

    Question is extremely easy. Basic substitution. You need first find an expression for area. Hint introduce another variable "l". Formulate the constraint, using x and "l". Using substitution eliminate "l" in the formula for area by making it the subject in the constraint. This gives area A...
  2. C

    Sig figs problem (chem)

    The thing is whether you can measure something or not. If you could only measure to the nearest 100 ml then yes 1 s.f. would make sense. If you could measure nearest 1ml then 3 s.f. would make sense
  3. C

    Please Expalin how to solve this Vectors Question

    Question is quite easy. Just basic trigonometry. Find x,y components of the vectors
  4. C

    proofs make me want to jump off a cliff

    a) is quite easy. Use the rule of product axiom. For there to be factor you got to decide how many you will choose p and q.
  5. C

    Vector proof q

    Seems fairly easy. Why don't you construct two equations involving HD?
  7. C

    Projectile Motion - smol question about velocity

    Generally we consider velocity for a 1-D dimensional case. That is on some straight line. E.g. the velocity of car on a road with respect to some origin. The issue with including multiple dimensions such as 2D is there are infinite number of directions that can be traveled. Any angle from...
  8. C

    Water Engineering

    I would suggest you ask person on Linkedln.
  9. C

    trig inequality qn

    you can multiply by 2sin x on both sides. So you end up with 2sin(x)cos(x) > 2sin^2(x) => sin(2x) > 2sin^2(x)
  10. C

    trig inequality qn

    Observe cos(x)>sin(x) for 0 < x < pi/4. Try visualising tan x using the unit circle definition [pi/4, pi/2) union [5pi/4, 3pi/2)
  11. C

    math in uni

    Often assignments are submitted using pen-paper. Or for online collaboration MS word doc. There is MathTex available in Microsoft Word, no understanding of Latex required. Also as mention by idkkdi Latex is supported in MS word. There is also math auto-proofing available although functionality...
  13. C

    here we go again :) - q7b ii) 2005 3uHSC: INV TRIG Q

    Yes
  14. C

    here we go again :) - q7b ii) 2005 3uHSC: INV TRIG Q

    So we don't consider the case when A<0 as per the question criteria. Think about what the curve will look like if there is only one root. This will give you an idea on how to perform the calculation.
  15. C

    how do i improve answer writing in my question papers?

    Often it will help to look at the marking criteria. Couple of possibilities: 1. Not enough references to primary and secondary sources were include. Generally about 5-6 per an essay 2. You didn't know how to structure a response to an essay question or particular dot point. What arguments are...
  16. C

    Trying to learn a new language (Japanese)

    Be very dilligent. Study every day but maybe not for long time. Practise reading, speaking, listening, writing. You will probably will have focus on hirigana, katakana first then kanji.
  17. C

    Trig Proof

    You have not shown working out
  19. C

    Mixing question

    so part b is really easy. Try reading the question again.
  20. C

    Locus Questions

    This is not relevant: "(distance formula for perp lines- ie abs(ax+bx+c)/sqrta^2+b^2) " The formula you seem to be referring to is finding the smallest distance of a point from a line. What is being used here is Pythagoras theorem. To answer your question in the image. We need to equate...
  21. C

    Can I get some help with questions?

    I have never seen such notation before. Do you have a reference?
  22. C

    series and sequences question

    Give the question a go. How are the terms of geometric sequence defined?
  23. C

    Sequences and Series

    I would avoid x and replace that with * but yes. the nth term of geometric sequence is a*r^(n-1)
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