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Maths, Addmaths and Statistics: Post your doubts here!

Discussion in 'Cambridge O Levels' started by OakMoon!, Apr 21, 2011.

  1. khadijaimran

    khadijaimran

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    how to do the highlighted question?
     

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  3. Binyamine

    Binyamine

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  4. A*****

    A*****

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  5. Zeerak 420

    Zeerak 420

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    Ok so this question is tough.

    Speed of sparrow is x km/h in STILL air.

    When wind is blowing at 1 KM/H, sparrow takes 5 hours to fly 12 km to nest and 12 km back again. She goes out directly into win and returns with wind behind her. Find Normal speed.
     
  6. aneeqgenius7

    aneeqgenius7

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    Last edited: Apr 28, 2017
  7. Thought blocker

    Thought blocker

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    Voulme of cylinder = pi r^2 h
    Volume of outter cylinder(VO) = pi (3.5 + r)^2 (20)
    volume of inner cylider (VI)= pi r^2 (20)
    Volume of solid = VO - VI
    3000 = VO - VI
    Solve for r
    r = 5.07
     
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  8. aneeqgenius7

    aneeqgenius7

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    thanks
     
  9. rid_aaaa

    rid_aaaa

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    can anybody please explain questions related to upperbond and lowerbond
     
  10. Thought blocker

    Thought blocker

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    Post the question. We will see where we can help u.
     
  11. khadijaimran

    khadijaimran

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    thank you so much :)
     
  12. A*****

    A*****

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    No pblm :)
     
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  13. Enferno

    Enferno

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    2017-05-14_200021.png

    part b anyone?

    4024_s15_qp21_q2
     
  14. A*****

    A*****

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  15. Enferno

    Enferno

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  16. A*****

    A*****

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    But y can't v use it? It's not written in the question that v can not use it
     
  17. A*****

    A*****

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    I don't think that there is any other way of solving it
     
  18. Enferno

    Enferno

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    I mean yes we can use it here. I'm looking for a way to solve without it.
    Now I don't think there is.
    Thank you by the way
     
  19. A*****

    A*****

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    No there isn't... in the mark scheme as well the same one is given
     
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  20. whyareallnamestaken

    whyareallnamestaken

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  21. Anon_Assassin

    Anon_Assassin

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    We always use this in finding the area of a graph. (UPPERBOUND - LOWERBOUND)
    For example in this graph,
    Screenshot_20170528-143148.png
    We will find the area by subtracting the blue curve from the red curve.
    This is also used when a line intersects the graph at more than two points.
    Hope this answers your question.
     

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