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  1. delta.charlie321

    Mathematics: Post your doubts here!

    Which syllabus are you following. I am mostly familiar with 0580 IGCSE mathematics. PS In questions 27 and 28, notice that they have given a set of coordinates where x is 0 like (0,5). Use this set of coordinates to find the value of c (which is equal to 5 in both q.27 and 1.28). From there you...
  2. delta.charlie321

    Mathematics: Post your doubts here!

    It is very difficult to answer the question without knowing which aspect of the question u find difficult? It probably looks like homework and you should try it on your own. But I will give you some tips. Q.22 find the gradient and then use y=mx+c and find the value of c Q.27 and 28 You need to...
  3. delta.charlie321

    Mathematics: Post your doubts here!

    For rotating an image by 90 degrees the direction must be specified to avoid ambiguity otherwise the marking scheme must allow for both directions. I dont know about 0607 Mathematics but in IGCSE 0580 a direction is always specified for 90 degree rotations so I would assume this to be true for...
  4. delta.charlie321

    Mathematics: Post your doubts here!

    I just found what the Examiners meant when they said the width of the water can be found out by the average of 25 and 35. They are talking about the median of the trapezoid, which is a line halfway between two bases. The median is always average of two bases.
  5. delta.charlie321

    Mathematics: Post your doubts here!

    Thank you so much. I just have one more question. In the examiner report they say another method is to find the average of 25 and 35 as the width of the water. Can you explain what is the mathematical basis for using this method? I cant find it in any textbooks or on the internet?
  6. delta.charlie321

    Mathematics: Post your doubts here!

    Could you elaborate more?
  7. delta.charlie321

    Mathematics: Post your doubts here!

    Can anyone explain in part b)i), how do you find the width of the water surface?
  8. delta.charlie321

    IGCSE June 2016 Marking Schemes

    C Cant access the drive link.. Its asking to request access
  9. delta.charlie321

    Mathematics: Post your doubts here!

    Thank you so much, I found the answer. How could I have forgotten the circle theorems
  10. delta.charlie321

    Mathematics: Post your doubts here!

    Anybody know how to do part b) ii) of this question??? Paper reference 0580/42/F/M/16 http://imgur.com/5eo3and
  11. delta.charlie321

    Biology; Chemistry; Physics: Post your doubts here!

    A small cylinder of compressed helium gas is used to inflate balloons for a celebration. (b) The helium in the cylinder has a volume of 6.0 × 10–3 m3 (0.0060 m3) and is at a pressure of 2.75 × 106 Pa. (i) The pressure of helium in each balloon is 1.1 × 105 Pa. The volume of helium in an...
  12. delta.charlie321

    Mathematics: Post your doubts here!

    Got it...Thank you
  13. delta.charlie321

    Mathematics: Post your doubts here!

    My question is how do you calculate EFA?
  14. delta.charlie321

    Mathematics: Post your doubts here!

    So how do you find angle EDA? You cant just assume drawing a line from A to D will halve the the angle EDC (140).
  15. delta.charlie321

    Mathematics: Post your doubts here!

    How do we know if we draw a line through AD it bisects the angle EDC as mentioned in the above answer post? According to Examiner report the assumption angle EDA = angle FAD = 70° is wrong. Please help.
  16. delta.charlie321

    Physics thinking distance and breaking distance question

    Is this a good question for thinking distance and breaking distance and does it have any mistakes? (I am a private tutor) 1. Car A and Car B is at rest at a traffic light. When the traffic light is green, both cars accelerate uniformly and then travel at a constant speed. At time t=0, car A is...
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