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Almost Halloween: GCE O Level Oct/Nov 2014 A-Maths 4047 Paper 2 Suggested Answers & Solutions

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Tuition given in the topic of Miss Loi the Tutor from the tuition centre desk of Miss Loi at 3:35 pm (Singapore time)

Remember me?

Sadako Loi

The Temple is dark and sad, and tears were shed.

Last Day @The Temple

Students with faces as sullen as mine were treasuring their final moments at the sanctuary before setting off for their final mathematical battle of their lives (at least until H1/H2/poly etc.).

P1000773a P1000813 P1000741

and more

By now, most would have slain and conquered the vile beast known as Additional Mathematics (new 4047 breed) this morning – with records of all lethal blows presented below:

Click the Like button and grab it here if you dare …

GCE O Level 2014 AMaths 4047 Paper 2 Solutions

Access it here if you’re having trouble accessing it on Facebook using your state-of-the-art smartphone 🙁

As usual, please, please leave a comment should you spot any mistake in the solution.

Latest versions:

  • 1.0a: Q3(ii) – added explanation of comparing coefficients to clarify how to arrive at 4c = −4, as pointed out by this kind gentleman 😉

Notes from my Mistress:

  1. Before you ask questions like “I lost x marks in Paper 2, can I still get A1/A2/B3/B4/pass?” or “What is the cutoff for A1/A2/B3/B4/C5/C6/D7/E8/F9 this year?”, please understand that Miss Loi is NOT the Bell Curve Goddess.
  2. Please also understand that, unless things have changed, there is no half-mark awarded in O-Level Maths. Also it is nigh impossible for ECF if the part involved only carries 1 mark.

So, I can almost “see” you at Halloween on Friday. But it’s more important now to maintain your focus and keep hanging in there, as urged by this student at The Temple:

You Just Keep Hangin' On

P.S. And should you need some quick help to get a grip on your remaining papers beyond this most exhausting of weeks, The Temple shall be open this Sunday and next Saturday for your final Social Studies & Chemistry MCQ tune-up respectively.

O Level 2014 Social Studies Chemistry MCQ workshops

Remember, remember. Now’s not the time to slip in November!

*begins to crawl out of your monitor screen*

頑張って!!!

Revision Exercise

To show that you have understood what Miss Loi just taught you from the centre, you must:

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Comments & Reactions

22 Comments

  1. soonek's Avatar
    soonek commented in tuition class


    2014
    Oct
    29
    Wed
    6:39pm
     
    1

    the answer to Q3 (ii):

    12 + c^2 +(4 sqrt3) c = 13 - 4sqrt3
    You then equate 4c = -4
    why can equate (4 sqrt 3) c = -4sqrt3?
    please explain. Thanks

  2. anon's Avatar
    anon commented in tuition class


    2014
    Oct
    29
    Wed
    8:58pm
     
    2

    Hi I know that this is a dumb question but I was just wondering for question 3ii when you compared the surds,how do you know that (4 sq root 3)= -4 sq root 3? like why not 12+4sq root 3= -4sqrt 3?:o

  3. Han Quan's Avatar
    Han Quan commented in tuition class


    2014
    Oct
    29
    Wed
    10:06pm
     
    3

    Hi. I have 2 questions. Is it acceptable if:

    (1) For question 1, they asked to determine if it was safe to give the food 4 minutes after removal. I found the temperature which was 38.something and I said as after 4 mins it's below 40 so it's okay? Your method was to find the time it took to go below 40, which was interesting.

    (2) In the kinematics question, they asked us to prove that the particle would reach P at t = 10 ln 5. Instead of your method I reasoned that at instantaneous rest v must be 0 and so I used t to calculate (to get 0).



    • 2014
      Oct
      30
      Thu
      12:25pm
       
      3.1

      @Han Quan: For Q1(iii), technically (and with just 2 marks here) you might get away with simply substituting t = 4 into the equation but, with the emphasis of exam questions on application of maths in practical situations these days, Miss Loi feels it's more robust to work this out using the inequality based on the question's condition for the safe temperature of the food to be "less than 40 °C".

      This is especially so if you happen to be given a more complex function in which T fluctuates above/below 40 °C as t increases (beyond scope of this discussion).

      For Q8(i), again technically you are not wrong to sub t = 10ln5 but with 6 (SIX) marks allocated for this part, Miss Loi suspects they may want to see some e & ln magic from you vs simply v = 0 from a press of your calculator button.

      Ultimately, it'll depend on the mark scheme so this is just her own thoughts.

      P.S. This seems analogous to the "must I derive or can I just simply substitute the values in the R-formula?" scenario.

  4. Unknown's Avatar
    Unknown commented in tuition class


    2014
    Oct
    30
    Thu
    12:24am
     
    4

    Hi! For the Kinematics question,I think I misinterpreted it... I thought it was to be show that when T= 10ln5 when particle reaches point P(aka v=0)

  5. Anonymous's Avatar
    Anonymous commented in tuition class


    2014
    Oct
    30
    Thu
    9:33pm
     
    5

    Hi. Thx for the answer. Will there be pure chemistry(5073) ans??

  6. Amanda's Avatar
    Amanda commented in tuition class


    2014
    Oct
    31
    Fri
    2:00pm
  7. Anonymous's Avatar
    Anonymous commented in tuition class


    2014
    Nov
    7
    Fri
    11:51pm
     
    7

    Hello! Will you be posting 5059 physics paper 1 answers for 2014? Thanks 🙂

  8. Anonymous's Avatar
    Anonymous commented in tuition class


    2014
    Nov
    13
    Thu
    9:55pm
     
    8

    Will you be able to post the answers to paper 1 of pure biology?

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