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  1. Princess Raven

    Mathematics: Post your doubts here!

    ppl... http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Mathematics%20%280580%29/0580_w12_qp_41.pdf q 9 part c? y dont we divide since its in second so to make it into 365 Days we do... 300000/3600/24/365 but the ms shows 300000x3600x24x365??
  2. Princess Raven

    Mathematics: Post your doubts here!

    ok and q6 is a really good question.. but read it very carefully.. it says OBTUSE angle and when we get 48.5 thats acute so minus it from 180 to get the obtuse part.. usually in math when a word is written in bold.. u should stress on that part.. many make this mistake
  3. Princess Raven

    Mathematics: Post your doubts here!

    ok i didn't get what u said.. the answer is 8.2 as given so u should find the slant height of the whole cone then of the small come using Pythagoras theorem and just subtract to get the slant height S
  4. Princess Raven

    Mathematics: Post your doubts here!

    ahhhh smart!!! ty a lot.. so one more question as u said for A' U B we shade the box too.. so how about A' ∩ B do u also shade the outside box?
  5. Princess Raven

    Grade Thresholds explanation?

    yay!!!
  6. Princess Raven

    Grade Thresholds explanation?

    um well the way i do it ( i do not know if its correct) is: ex for bio i get 35/40 so u do (35/40*0.3) and in p3 ex 72 then u do (72/80*0.5) and in p6 ex 30 u do( 30/40*0.2) then add all the decimals together so itll be (0.2625+0.45+0.15)then multiply by 200 so ur final mark will be 172.5 I DO...
  7. Princess Raven

    Mathematics: Post your doubts here!

    guys!!! for sets how in the world are we suppose to know when we have to shade everything or only the circles? for ex A' U B do we shade the box or only B??? HELP PLX
  8. Princess Raven

    How the kidney work in excretion explanation, help

    no problem! glad i could help :)
  9. Princess Raven

    How the kidney work in excretion explanation, help

    sure.. ok first the kidney is made up tiny tubules called nephrons.. this is where filtration takes place. the kidney is made up of 3 layers, the cortex, medulla and the pelvis.. and connected to the pelvis is the ureter used to take urine to the bladder where its stored before getting removed...
  10. Princess Raven

    Physics, Chemistry and Biology: Post your doubts here!

    q 4 part f is wrong.. they will have the same height because the solution is saturated and can dissolve no more solute.. and part e is correct but would u mind explaining it to me.. i dont get it.. everything else is correct except the table entry but yes u had mentioned it was according to the...
  11. Princess Raven

    Physics, Chemistry and Biology: Post your doubts here!

    ill check it out :)
  12. Princess Raven

    Physics, Chemistry and Biology: Post your doubts here!

    guys do amphibians have internal or external ears?
  13. Princess Raven

    Physics, Chemistry and Biology: Post your doubts here!

    i think it cant be done by electrolysis because its lower than carbon in the reactivity series.. it can only be done by the reduction of its oxide by carbon!
  14. Princess Raven

    Physics, Chemistry and Biology: Post your doubts here!

    No problem! just wanted to ensure ppl dont get confused lol.. and thats really helpful for the boy! insA he will do well!
  15. Princess Raven

    Physics, Chemistry and Biology: Post your doubts here!

    lol IKR there was a question in w12 v32 it was sooo weird..but anyhow ya i think its sublimation THANKS alot for ur help!!!!!
  16. Princess Raven

    Physics, Chemistry and Biology: Post your doubts here!

    its just the point where they intersect.. which is 22.5
  17. Princess Raven

    Physics, Chemistry and Biology: Post your doubts here!

    for p31? part a volume of o2 left just use the mole ratio 1: 6.5 and thus 10: x then cross multiply u get 65 but since they want how much is left we do 100-65 which will give u 35. and the same goes for the next 1:4 thus 10:x cross multiply and get 40cm3
  18. Princess Raven

    Physics, Chemistry and Biology: Post your doubts here!

    first in q 1 c (i) id suggest u say they react with water vapour not water alone.. then q 4 part b ur third reason seems to be incorrect transition metals are always hard and strong never say soft.. then q 5 b (i) copper metal is incorrect its copper oxide and the balancing of 5 b ii is...
  19. Princess Raven

    Physics, Chemistry and Biology: Post your doubts here!

    I dont know where u got that from but i dont think we need to know the relation.. u just need to know that step up transformers reduces current and how we can prevent to much energy lost.. there are many ways.. like using thick copper wires to reduce heat loss or use an iron core
  20. Princess Raven

    Physics, Chemistry and Biology: Post your doubts here!

    thanks!! oh just one more question could u tell me the equlibrium equation that occurs during melting??? and how do we make 1-chloropropane from propane? is it substitution rxn? THANKS!!
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