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Recent content by felicia tan

  1. felicia tan

    Mathematics: Post your doubts here!

    need help here. How to do 8 iii)? How can I integrate −20 +(2000)/(10 − h)(10 + h) ?? http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w08_qp_3.pdf
  2. felicia tan

    Mathematics: Post your doubts here!

    need help here. How to do 8 iii)? How can I integrate −20 +(2000)/(10 − h)(10 + h) ?? http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w08_qp_3.pdf
  3. felicia tan

    Chemistry: Post your doubts here!

    The cracking of a single hydrocarbon molecule, CnH2n+2, produces two hydrocarbon molecules only. Each hydrocarbon product contains the same number of carbon atoms in one molecule. Each hydrocarbon product has non-cyclic structural isomers. What is the value of n? A 4 B 6 C 8 D 9...
  4. felicia tan

    Chemistry: Post your doubts here!

    Use of the Data Booklet is relevant to this question. Ethyl ethanoate can be obtained from ethanoic acid and ethanol by the following reaction. CH3CH2OH + CH3CO2H CH3CO2CH2CH3 + H2O Ethanol (30 g) and ethanoic acid (30 g) are heated under reflux together, and 22 g of ethyl ethanoate are...
  5. felicia tan

    Chemistry: Post your doubts here!

    thank you!
  6. felicia tan

    Chemistry: Post your doubts here!

    37 Which compounds may result from mixing ethane and chlorine in the presence of sunlight? 1 CH3CH2Cl 2 CH3CH2CH2CH3 3 CH3CHCl CHCl CH3 Can anyone explain to me why is the answer A (1,2 and 3 is correct)
  7. felicia tan

    A level Statistics doubt??Post your doubts here!

    i got it now. THANKYOU SO MUCH!!
  8. felicia tan

    A level Statistics doubt??Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w11_qp_61.pdf can anyone solve 5(i) ? I get 7.717 for the SD but marking scheme gave 6.38
  9. felicia tan

    A level Statistics doubt??Post your doubts here!

    thanks!!!
  10. felicia tan

    A level Statistics doubt??Post your doubts here!

    question 3 (ii) http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w09_qp_61.pdf how do you solve this?
  11. felicia tan

    A level Statistics doubt??Post your doubts here!

    t thank you very much! I can do it now :)
  12. felicia tan

    A level Statistics doubt??Post your doubts here!

    can anyone help me to solve 3b?http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s07_qp_6.pdf
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