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Edexcel: 11th and 14th June 2013 (Linear) 1MA0/1H + 2H (Official Thread) Watch

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    Hey everyone!
    I was watching Mathswatch clip 173 - sine and cosine rules
    The CD does:
    27.3^2 + 10.7^2 - 2 x 27.3 x 10.7 x cos62.
    The problem is that it comes up with 585.5053236 but my calculator gives me 531.399649 and I even cheecked google calculato which gives me 466.303645627 !!!!

    Who's right and who's wrong?!?!?!?! My calculator isn't broken is it?
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    (Original post by HarmanK)
    Hey everyone!
    I was watching Mathswatch clip 173 - sine and cosine rules
    The CD does:
    27.3^2 + 10.7^2 - 2 x 27.3 x 10.7 x cos62.
    The problem is that it comes up with 585.5053236 but my calculator gives me 531.399649 and I even cheecked google calculato which gives me 466.303645627 !!!!

    Who's right and who's wrong?!?!?!?! My calculator isn't broken is it?
    Mathswatch has a lot of mistakes in some of the answers.
    I'm pretty sure you're right... I also found several mistakes earlier on quadratics.
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    (Original post by cleveradam)
    Mathswatch has a lot of mistakes in some of the answers.
    I'm pretty sure you're right... I also found several mistakes earlier on quadratics.
    But what I don't get is that Mathswatch, me and google translator ALL got a different answer from each other... so if mathswatch's wrong is Google translator right or is my calculator right?

    Or am I just doing something stupid altogether?
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    (Original post by HarmanK)
    But what I don't get is that Mathswatch, me and google translator ALL got a different answer from each other... so if mathswatch's wrong is Google translator right or is my calculator right?

    Or am I just doing something stupid altogether?
    Tell me the question, I'll work it out and tell you what I get.
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    (Original post by cleveradam)
    Tell me the question, I'll work it out and tell you what I get.

    27.3^2 + 10.7^2 - 2 x 27.3 x 10.7 x cos62

    Could you try it out on your calculator please?
    Thanks
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    (Original post by HarmanK)
    27.3^2 + 10.7^2 - 2 x 27.3 x 10.7 x cos62

    Could you try it out on your calculator please?
    Thanks
    585.5053236

    Square root of that is 24.19721727
    ans to 3SF = 24.2CM

    Make sure you're inputting the numbers correctly. DO NOT ROUND UP TILL FINAL ANSWER.
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    (Original post by cleveradam)
    585.5053236

    Square root of that is 24.19721727
    ans to 3SF = 24.2CM
    So mathwatch was right...
    I'll just check it on other people's calculators tommarow to see if I need a new one... (probably will as it's still giving the wong answer )

    Thanks for your help!
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    (Original post by HarmanK)
    So mathwatch was right...
    I'll just check it on other people's calculators tommarow to see if I need a new one...

    Thanks for your help!
    Make sure your calculator is on degrees mode - should have a small 'D' on the screen.
    If not, change it to Degrees mode and you should get the correct answer.
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    (Original post by HarmanK)
    Hey everyone!
    I was watching Mathswatch clip 173 - sine and cosine rules
    The CD does:
    27.3^2 + 10.7^2 - 2 x 27.3 x 10.7 x cos62.
    The problem is that it comes up with 585.5053236 but my calculator gives me 531.399649 and I even cheecked google calculato which gives me 466.303645627 !!!!

    Who's right and who's wrong?!?!?!?! My calculator isn't broken is it?
    Mine got that too

    I was meant to quote cleveradam, I got 585.505...
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    (Original post by cleveradam)
    Make sure your calculator is on degrees mode - should have a small 'D' on the screen.
    If not, change it to Degrees mode and you should get the correct answer.
    PERFECT!!!!
    Thanks alot!!! but I don't really know all this degree and radian stuff and wouldn't know what i'd need in the exam, could you please give a explaination on what does what and when i'll need it?
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    A bit stressed because I cannot answer literally any of the 100 hard questions on maths247 youtube, but I seem to handle past papers ok
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    Does anyone know what the possible marks were for question 11 (Debbie faster than Ian graph) and question 13 (Does the boat come within 500m)
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    (Original post by cmorga1)
    Does anyone know what the possible marks were for question 11 (Debbie faster than Ian graph) and question 13 (Does the boat come within 500m)
    Question 11 was 4 marks I think and question 13 was 3 marks. I may be wrong.
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    (Original post by Captain Anonymous)
    Predicted boundary for an A grade?


    Posted from TSR Mobile
    No lower than 120, no higher than 140 and I'm guessing it may be between 120 and 130. Compared to the March paper, there's been a lot more mixed reactions from those who sat the non calc so maybe there will be lower grade boundaries. Let's just see what happens in Friday's paper...
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    Anyone else find calculator harder than non-calc? I mean come on! Non-calc topics aren't half as hard as cosine law, trig graphs etc
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    (Original post by HarmanK)
    Hey everyone!
    I was watching Mathswatch clip 173 - sine and cosine rules
    The CD does:
    27.3^2 + 10.7^2 - 2 x 27.3 x 10.7 x cos62.
    The problem is that it comes up with 585.5053236 but my calculator gives me 531.399649 and I even cheecked google calculato which gives me 466.303645627 !!!!

    Who's right and who's wrong?!?!?!?! My calculator isn't broken is it?
    Maths watch is right, you plug in all numbers in the calculator without brackets or any thing, the whole formula in the Calculator gives me 585
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    Has anybody got the PiXL prediction paper?
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    How do you do this question..

    21. A field is in the shape of a rectangle.
    The width of the field is 28 metres, measured to the nearest metre.
    (a) Work out the upper bound of the width of the field.
    ......................... metres


    The length of the field is 145 metres, measured to the nearest 5 metres.
    (b) Work out the upper bound for the perimeter of the field.
    ......................... metres

    I know how to do it.. but the answer's weird. :/
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    (Original post by HarmanK)
    But what I don't get is that Mathswatch, me and google translator ALL got a different answer from each other... so if mathswatch's wrong is Google translator right or is my calculator right?

    Or am I just doing something stupid altogether?
    Is your calc on degree mode?


    Posted from TSR Mobile
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    Ub of first is 28.5m. Ub of second is 147.5m

    28.5 x 2 + 147.5 x 2 = 352
 
 
 
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