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# OCR (MEI) C2: Friday 15th Jan 2010 watch

1. (Original post by nahg40)
i du get the feeling i may have sat a different paper... is the OCR (MEI) different to the normal OCR?
yes it is different i believe
2. (Original post by milad007)
hi guys this paper today was easier than jun 2009 i done that paper and i run out of time but 2day it was very easy

i want to confirm few quations with you guys

the first integration was x^2+3X^-1+C
the sector question 6.5cm the radius
trapizium rule 49. sumfing lol
integration was 50. sumfing
the last log rule the gradient was 0.012 the equation was P=100*10^0,012t
Think you got that integration one wrong... the first value is not x^2 it was 1/2x^2...... Just a heads up..
3. For Question 10 the x^3-3x^2-9x one the co ordinates where it crossed the x axis. I used the formula to get 3+or- the Square root of 45 all over 2. Did anyone els get this?? Its been bugging me. Apart from that think it all went well.

Last question i put that the population doesnt increase at a constant rate and according the the model it does.

And for question two i also had no idea so worked it out mathmatically, i got 5 and 165.. anyone els?

And what was everyones equation for P in terms of T?? I got the gradient to be like 7.22 or something and the intercept to be like 95. something not sure.. as it was originaly 2. something and i had to de log it to get it in terms of P. SOrry all sounds confusing!
4. (Original post by Snake91)
i disagree with your integration question infact ive still got that equation saved on my calculator and i used the integration function and it gave me the answer 47.664 which was what i got when i integrated it by hand. the trapezium rule gave something along the lines of 47.5 or something.
i got exactly that as well, but the rectangle thing gaveme a stupid number
my calculator couldnt cope with all the numbers (took ages) and i was runninh out of time so just left the working
5. if you look on page one or two i believe i have posted all my awnsers i got.
6. (Original post by MikeLHolford)
For Question 10 the x^3-3x^2-9x one the co ordinates where it crossed the x axis. I used the formula to get 3+or- the Square root of 45 all over 2. Did anyone els get this?? Its been bugging me. Apart from that think it all went well.

Last question i put that the population doesnt increase at a constant rate and according the the model it does.

And for question two i also had no idea so worked it out mathmatically, i got 5 and 165.. anyone els?

And what was everyones equation for P in terms of T?? I got the gradient to be like 7.22 or something and the intercept to be like 95. something not sure.. as it was originaly 2. something and i had to de log it to get it in terms of P. SOrry all sounds confusing!
I got that too for the coordinates.
7. (Original post by rick4236)
I got that too for the coordinates.
erm i got 3 +/- 3 root 5 all over 2, or sumin similar. n if u got it ryt so did i
8. I've got the paper. How do I upload it, presuming I'm allowed?
9. because you all think this paper was pretty easy does that mean the one in june will be alot harder
10. (Original post by Straightpath)
I've got the paper. How do I upload it, presuming I'm allowed?
Go onto post a reply and then click the little paperclip for attachment. I don't see why you won't be allowed...then we can discuss more what we got for answers
11. (Original post by underscore123)
because you all think this paper was pretty easy does that mean the one in june will be alot harder
Haha not necessarily...so long as you do ALL the past papers you'll be absolutely fine cos the layout doesn't change much!
12. (Original post by MikeLHolford)
Think you got that integration one wrong... the first value is not x^2 it was 1/2x^2...... Just a heads up..
I agree. I got x^2/2 which is the same thing
13. (Original post by kellywellydoodle)
I disagree...I did the C2 today as a resit and I think today's was MUCH easier. The sequence and series questions weren't weirdly worded like last years. Once you've studied C3, C2 is ridiculously easy lol!
Totally agree. Last year's sequences stuff I could NOT do in the exam (but when revising found it fine!)

(Original post by Snake91)
i disagree with your integration question infact ive still got that equation saved on my calculator and i used the integration function and it gave me the answer 47.664 which was what i got when i integrated it by hand. the trapezium rule gave something along the lines of 47.5 or something.
I'm pretty sure you're not allowed calculators in the exam that can do integration.
14. (Original post by microfatcat)
I'm pretty sure you're not allowed calculators in the exam that can do integration.
Half of our class have calculators which can do calculus. One of them even has one that can draw graphs

But overall, I thought the paper was pretty standard compared to past papers. Or it would have been, had I not realised that I'd missed Q10 parts (ii) and (iii) out 5 minutes before the end of the exam. Still just about managed to finish it and get it right, but the graph looks like it's been drawn by someone with arthritis. Hopefully it hasn't cost me...
15. (Original post by Straightpath)
I've got the paper. How do I upload it, presuming I'm allowed?
Yeah you are allowed
16. (Original post by microfatcat)
Totally agree. Last year's sequences stuff I could NOT do in the exam (but when revising found it fine!)

I'm pretty sure you're not allowed calculators in the exam that can do integration.
Thank goodness I've found someone else that sat there last thinking at the way the sequence and series question was worded. I did the paper again as revision this time round...and even though I knew all the formulas...it wasn't obvious what they were getting at. It was their whole "they get a further £5 each time they get a question right" or something...where I wasn't sure whether they meant it was a common difference that was constantly 5 or whatever it was...or whether they meant that 5 was added to the previous prize on top if that makes sense...ah sooo confusing!

I have a calculator that has the ability to do calculus...but I have no idea how to work it lol! It says your allowed graphical calculators...and I looked all over on the net and asked my teachers whether I was allowed to use my calculator in the exam...and there was only one site that said I couldn't which seemed to be contrary to what my exam board said...so I decided to believe my teachers. I didn't use that function of it anyway cos I'm technologically hopeless
17. My calculator does it too, it's good for checking answers but they can tell you've used it if you've no working and you won't get the marks.
18. (Original post by kellywellydoodle)
Thank goodness I've found someone else that sat there last thinking at the way the sequence and series question was worded. I did the paper again as revision this time round...and even though I knew all the formulas...it wasn't obvious what they were getting at. It was their whole "they get a further £5 each time they get a question right" or something...where I wasn't sure whether they meant it was a common difference that was constantly 5 or whatever it was...or whether they meant that 5 was added to the previous prize on top if that makes sense...ah sooo confusing!

I have a calculator that has the ability to do calculus...but I have no idea how to work it lol! It says your allowed graphical calculators...and I looked all over on the net and asked my teachers whether I was allowed to use my calculator in the exam...and there was only one site that said I couldn't which seemed to be contrary to what my exam board said...so I decided to believe my teachers. I didn't use that function of it anyway cos I'm technologically hopeless
http://www.mathsnetalevel.com/index.php?ref=CALCS According to this site you aren't, and my maths teacher was like noo way, only the IB people are allowed graphical calculators. It's weird they haven't been banned though, since the idea is that you use your brain in working stuff out :P I haven't got one since they're like £25 and I'm not IB/going to do maths at uni! And if I wanted to check my answers, just use Autograph or Grapher to plot things.

The question was hard (at the time, anyway) to work out whether it was geometric or arithmetic, and whether it was difference, or ratio, or whether the money was adding onto the ratio or becoming the new ratio, or what! Though I could do it easily for revision, at the time, my friends and I could not do it, far too wordy. I just didn't know WHAT was going on. Maybe I'm just easily confused!
19. I got pretty much the same answers as all of you lot.
One thing bothering me since the exam was that in the population questions

me intercept was slightly smaller at = log1.8 ( so 63.1)
and my gradient was = 0.0118 so 0.012 ish
therefore my population of Africa at 2050 was slightly smaller at around 1024 Million.

Do you think i will still get the marks? because iknow in the mark schemes it usally gives you quite a big leeway with these log graph questions as peoples answers vary
20. (Original post by microfatcat)
http://www.mathsnetalevel.com/index.php?ref=CALCS According to this site you aren't, and my maths teacher was like noo way, only the IB people are allowed graphical calculators. It's weird they haven't been banned though, since the idea is that you use your brain in working stuff out :P I haven't got one since they're like £25 and I'm not IB/going to do maths at uni! And if I wanted to check my answers, just use Autograph or Grapher to plot things.

The question was hard (at the time, anyway) to work out whether it was geometric or arithmetic, and whether it was difference, or ratio, or whether the money was adding onto the ratio or becoming the new ratio, or what! Though I could do it easily for revision, at the time, my friends and I could not do it, far too wordy. I just didn't know WHAT was going on. Maybe I'm just easily confused!
Yeh that's the site I saw...but everywhere else says it's fine AND on the front of the exam papers it says you are allowed to use a graphical calculator for the paper. If it was an issue I'm sure my school would have picked up on it cos they are VERY strict. Yehhh same...I managed it in my revision once I'd decoded it's meaning. I don't think it's fair when it's like that...when you do understand how to work it out but you don't understand what the question is saying cos of how they phrased it...oh well least it's sorted now. You doing C3 next Wednesday?

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