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Thread: International Baccalaureate Marathon

  1. #101
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    Re: International Baccalaureate Marathon

    Was going through worked example from Cambridge tonight and there was a mistake in the working out for part (c), vector BC should be -2-k. Small mistake but its important that I point it out to all IBers in 2017:

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    Re: International Baccalaureate Marathon

    Quote Originally Posted by davidgoes4wce View Post
    Was going through worked example from Cambridge tonight and there was a mistake in the working out for part (c), vector BC should be -2-k. Small mistake but its important that I point it out to all IBers in 2017:

    Wow, how much maths do you do a day?
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    Re: International Baccalaureate Marathon

    Quote Originally Posted by boredofstudiesuser1 View Post
    Wow, how much maths do you do a day?
    Not that much. I just went to the gym for about an 1.5 hour, also did a bit of driving and I went out to the library for a bit of fresh air.
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    Re: International Baccalaureate Marathon

    Quote Originally Posted by davidgoes4wce View Post
    Was going through worked example from Cambridge tonight and there was a mistake in the working out for part (c), vector BC should be -2-k. Small mistake but its important that I point it out to all IBers in 2017:

    What do you mean? The vectors b and c have no k, so vector BC would have no k.

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    Re: International Baccalaureate Marathon

    Quote Originally Posted by InteGrand View Post
    What do you mean? The vectors b and c have no k, so vector BC would have no k.
    I meant vector AB, should have been -2-k.
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    Re: International Baccalaureate Marathon


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    Re: International Baccalaureate Marathon





























    Last edited by davidgoes4wce; 15 Feb 2017 at 11:48 PM.
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    Re: International Baccalaureate Marathon

    Quote Originally Posted by davidgoes4wce View Post




























    The area values you got are all very close. Haven't checked your calculations but if they're all right, the small discrepancies would just be due to the fact that you used rounded values for the angle.

    Last edited by InteGrand; 16 Feb 2017 at 6:25 AM.

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    Re: International Baccalaureate Marathon

    Not sure what the best way to study for sequences and series, whether it be HSC or IB but should we tell the students to memorise the formulae (even though the formuale sheet is provided)?
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    Re: International Baccalaureate Marathon







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    Re: International Baccalaureate Marathon

    OK problem solved if you guys are familiar with the Casio fx-9860G AU, you should leave the fraction to the right and not cross multiply in Solver.





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    Re: International Baccalaureate Marathon

    This is a Band 7 IB question (equivalent to a HSC Band 6 aiming for 95%+ on paper)



    With regards to (b) , would it be OK to not write the answer involving sequences? i.e doing it manually in order to get the marks







    My way I did it was just using the 'common sense method':



    Notice both answers do give slightly different decimal values .
    Last edited by davidgoes4wce; Yesterday at 9:37 PM.
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    Re: International Baccalaureate Marathon

    Quote Originally Posted by davidgoes4wce View Post
    This is a Band 7 IB question (equivalent to a HSC Band 6 aiming for 95%+ on paper)



    With regards to (b) , would it be OK to not write the answer involving sequences? i.e doing it manually in order to get the marks







    My way I did it was just using the 'common sense method':



    Notice both answers do give slightly different decimal values .
    0.892 and 0.655536 are wrong. By doing it manually like this you are greatly increasing the number of points at which you can mess up the calculation. And of course this won't be feasible if 9 is replaced by 1000.

    The correct answer is the expression t8 (although the 2 is +2, not -2), which in decimal form is exactly 15.31564544.

    Ps. alarm bells should be ringing in your head at "slightly different decimal values". The only step in which any rounding is involved is at the very end, so these answers should coincide exactly prior to rounding, which they clearly don't.
    Last edited by seanieg89; Yesterday at 3:33 PM.
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    Re: International Baccalaureate Marathon

    OK yep I see it

    should be 0.8192 metres and 0.65536 metres
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    Re: International Baccalaureate Marathon

    Quote Originally Posted by seanieg89 View Post
    0.892 and 0.655536 are wrong. By doing it manually like this you are greatly increasing the number of points at which you can mess up the calculation. And of course this won't be feasible if 9 is replaced by 1000.

    The correct answer is the expression t8 (although the 2 is +2, not -2), which in decimal form is exactly 15.31564544.

    Ps. alarm bells should be ringing in your head at "slightly different decimal values". The only step in which any rounding is involved is at the very end, so these answers should coincide exactly prior to rounding, which they clearly don't.
    I'm aware that there was a slight error with my working out but in terms of 'method' of getting to the answer, there are 2 methods in order to get to the right answer.

    Would my method be suitable in order to answer a question like this, whether it be HSC and/or IB?
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