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Mathematics: Post your doubts here!

Discussion in 'International A And AS Level' started by XPFMember, Sep 8, 2011.

  1. IN NEED OF HELP

    IN NEED OF HELP

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    guys please help...
    What will be american GPA if I get 2 C and 2 D in ALevels....?
    Please help me in selecting four years college and my SAT score is 1300. I also have 2.6 GPA but it didn't
     
  2. XPC Bot

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  3. I Only ask questions

    I Only ask questions

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    a motorbike and a car are waiting side by side at traffic lights.
    when the lights turn green, the motorbike accelerates at 2.5 ms^-2 up to a top speed of 20ms^-1 and the car accelerates at 1.5 ms^-2 up to a top speed of 30ms^-1. both then continue to move at a constant speed. draw (t,v) graphs for each vehicle, using the same axes, and sketch the (t,s) graphs.
    A. after what time will the motorbike and the car again be side by side?
    B. what is the greatest distance that the motorbike is in front of the car?
    Can you help me with no. B and I got 22 seconds for a).
    the answers say 160/3 is the answer for b) but how?
     
  4. Hamnah Zahoor

    Hamnah Zahoor

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    Do we need to prepare for paper 2 and paper 3 both in order to give Pure mathematics 3 in A level Math!
     
  5. A*****

    A*****

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    I don't think so
     
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  6. Hamnah Zahoor

    Hamnah Zahoor

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    Ok.......I have read in the syllabus that paper 2 is a subset of paper 3 but paper 3 contains some additional topics from Paper 2.
     
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  7. ashiqbal

    ashiqbal

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    can anyone tell me if there is a problem with the past papers link?
    coz i cant download past papers from there. :/
     
  8. sukasukinya

    sukasukinya

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    Help me to solve (ii) please :’(
     

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  9. studyingrobot457

    studyingrobot457

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    take the log on both sides
    since log(a^b) = b*log(a)
    y*log(3) = (x-2)*log(4)

    and you can solve easily from here
     
  10. studyingrobot457

    studyingrobot457

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    xtremepapers past papers is down for good :(

    just utilise gceguide.com or other past paper websites, if you are looking for old papers, then freeexampapers.com
     
  11. sukasukinya

    sukasukinya

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    Help me! How to show the factorisation of this cubic equation? I know the answers by using calculator but dunno how to show it :’(
     

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  12. studyingrobot457

    studyingrobot457

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    t
    take x as common and factorise quadratic
     
  13. Mijandi@7

    [email protected]

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    The volume of soup in Super Soup cartons has a normal distribution with mean - millilitres
    and standard deviation 9 millilitres. Tests have shown that 10% of cartons contain less than
    440 millilitres of soup. Find the value of -. [3]

    (ii) A food retailer orders 150 Super Soup cartons. Calculate the number of these cartons for which
    you would expect the volume of soup to be more than 1.8 standard deviations above the mean.
    [3]

    Can anyone explain how to tackle part ii) correctly? I don't understand the mark scheme either
     
  14. hellodjfos;s'ff

    hellodjfos;s'ff

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    Usually you try to factorise it by taking something common between 2 monomials and something else common between the other 2 monomials. That isn't the case here. So what you do is, you write that equation in your calculator, pick one of the answers and write down the factor theorem for it(this is for the working mark, the quickest way to do it). Otherwise, you can just use the trial and error method(takes way too long). Next up, you divide your cubic equation by the factor to try and get a quadratic equation. For this division, I recommend you use the long division method to find the quadratic equation. Once you get the quadratic equation, you factorise it to get the other two factors and you're done.
    Note: You may use synthetic division instead of long division.
     
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  15. hellodjfos;s'ff

    hellodjfos;s'ff

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    You may also use trial and error method to find all 3 factor but it would take way too long as you would have to write down all the working with it, plus it's unlikely that you'll get full marks for working.
     
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  16. Mush999

    Mush999

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    Hello, did anyone else reading this do CIE A/L Mechanics this time ( oct/Nov 2018 42)
    I'm really scared about the last question (Q7) what did you all get the answer for it?
    The second part of the question rewarded 7 marks but the workings for it was just in 5 steps. I'm really worried, can someone be kind enough to reply. So we could discuss, because I don't have other friends doing math AS and I study at home alone by myself.
    So I'm literally all alone in this.

    Thank you in advance.
     
  17. kfemknwnsx

    kfemknwnsx

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    could someone explain how to do differential equations? it's the only topic i don't understand in p3
     
  18. Lemniscates

    Lemniscates

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    Check your inbox.
     
  19. A*****

    A*****

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    Can anybody help with its (ii) part? It is from M/J 2012 v33 and the answer is 100/e.

    Screenshot_20181226_175122.png
     
  20. Unknown202

    Unknown202

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    can someone please solve this one a) and b)
    upload_2018-12-30_10-57-1.png
    upload_2018-12-30_10-57-33.png
     
  21. A*****

    A*****

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    Angle OCB=68° (Alternate angles)
    Angle OBC=68° (Isosceles triangle)
    BOC+68+68=180 ---> BOC=44°

    BCE=180-68=112° (interior angles)
    ACB=90° (angle in a semi circle)
    ACE=360-112-90=158°
     
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