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  1. A

    Chemistry: Post your doubts here!

    I Scored a U in chemistry AS practicals although my components for paper 1 and 2 were an A and a B. I practiced Paper 3 a lot and yet me and all of my friends scored the same grade. Can anyone give me some tips to follow to score an A grade or a B grade for my paper 3
  2. A

    Maths P12 !!!!!!!

    why -12/-1=12
  3. A

    Maths P12 !!!!!!!

    yes you are right about the a and r but i dont think the coordinates are incorrect check my work
  4. A

    Maths P12 !!!!!!!

    11) in the stated domain 0 and 2pi f(x)=6-4cos(1/2x) 6-4cos(1/2x)=4 -4cos(1/2x)=4-6=-4cos(1/2x)=-2 Cos(1/2x)=1/2 Cos^-1(1/2)=60 1/2x=60 x=120 Cosine lies between -1 and 1 so 6-4(1) and 6-4(-1) so the range of values are 2 and 10 Y=cosx y=4cosx y=-4cosx y=6-4cosx y=6-4cos(1/2x) The vertical...
  5. A

    Maths P12 !!!!!!!

    10) d^2y/dx^2=24/x^3-4 dy/dx=24/2x^-2-4x+k at y'=0 and x=2 k=11 y=24/2 x^-1-4/2x^2+kx+c at y=13, x=1 c=-8 10i) a curve has y'' = f(x) the curve has a stationary point: y' = 0 at x=2 so we determined y' = -12x^(-2)-4x + 0 = -12/(2)^2 -4(2) + k 0 = -3 -8 + k ; k=11 Now find y(2)...
  6. A

    Maths P12 !!!!!!!

    y2-y1/x2-x1=-3-6/5-2=-9/3=-3 Parallel lines share the same gradient y-y1=m(x-x1)=y-6=-3(x-2)=y-6=-3x+6=y=-3x+12 AD is perpendicular to CD the gradient is the reciporical to the gradient of equation AB. Equation of CD and AD CD=y-3=-3(x-8) y-3=-3x+24, y=-3x+27 AD=y-6=1/3(x-2)=3y-18=x-2=3y=x+16...
  7. A

    Maths P12 !!!!!!!

    n/2(2a+(n-1)d)=32n-n^2 2an/2+dn^2/2-dn/2=32n-n^2 an+dn^2/2-dn/2=32n-n^2 Calculate the common difference by collecting only the terms which are n^2. dn^2/2=-n^2 n^2 are cancelled out, d/2=-1 d=-2 Now, collect the "n" terms and "n"s are cancelled out. -dn/2+an=32n -(-2)/2+a=32 a=32-1=31 ar^n-1...
  8. A

    Maths P12 !!!!!!!

    AM = AO + OM = AO + OX/2 = AO + (OD+DX)/2 = (-8,0,0) + [(4,4,0) + (0,0,10) ]/2 = (-8,0,0) + [(4,4,10)]/2 = (-6i,2j,5k) AC=OC-OA =(0,8j,0)-(8i,0,0)=(-8i,8j,0) MAC=AM*AC=(-8*-6)+(2*8)+(5*0)=64 Cos(x)=64/((-6)^2+(2)^2+(5)^2)^1/2*((-8)^2+(8)^2)^1/2=cos^-1(0.701)=45.44
  9. A

    yes of course there's a chance of getting an A. paper 12 was not that easy to have such high...

    yes of course there's a chance of getting an A. paper 12 was not that easy to have such high grade thresholds so don't worry
  10. A

    will be posted soon on the P12 math thread

    will be posted soon on the P12 math thread
  11. A

    Maths P12 !!!!!!!

    Maths Paper 12 1) y=x^2+1, x=(y-1)^1/2 use ∫ → π x^2dy Set the limits from 5 to 1. 1/2 and ^2 gets cancelled so we are left with (y-1)^1. (y-1)^2/2. (5-1)^2/2-(1-1)^2/2*pi=8pi 2) Use Pythagorean theorem to find AB=((12)^2+(5)^2)^1/2=13 Use Sin Rule 13/sin90=5/Sinx...
  12. A

    Maths P12 !!!!!!!

    is p=3
  13. A

    Maths P12 !!!!!!!

    Anyone here knows where i can find paper 12 9709 question paper?
  14. A

    Maths P12 !!!!!!!

    Unless you've added some work then of course you will receive some marks, the answer it self can have 7 marks, working is needed. Don't worry :). It depends on whether the exam was easy or not, if its on the same level of difficulty as june 2014 p12 , then probably the B would have a range of...
  15. A

    Maths P12 !!!!!!!

    When are the questions of the paper out?
  16. A

    Mathematics: Post your doubts here!

    Thank you so much :)
  17. A

    Mathematics: Post your doubts here!

    http://justpastpapers.com/cie-a-level-mathematics-paper-1-9709-pure-mathematics-1-past-papers/
  18. A

    Mathematics: Post your doubts here!

    http://onlineexamhelp.com/wp-content/uploads/2014/08/9709_s14_qp_11.pdfhttp://onlineexamhelp.com/wp-content/uploads/2014/08/9709_s14_qp_11.pdf Q10 ii) and iii) and Q11 ii)
  19. A

    SOLVED HARDEST questions for QUICK last day REVISION

    http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Accounting%20(0452)/0452_s13_qp_21.pdf Q 3a Why the inventory at 1 Februray 2012 is added?
  20. A

    Accounting doubts & Queries

    http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Accounting%20(0452)/0452_s13_qp_21.pdf Q 3a Why the inventory at 1 Februray 2012 is added?
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