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Mathematics: Post your doubts here!

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Hey guys....need some help.

May/June 2011 Paper 2 Variant 23
Q22b)ii) The answer that I am getting is 208 m/s^2. But the actual answer is 0.208m/s^2 HOW???
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s11_qp_23.pdf (Question Paper)
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s11_ms_23.pdf (Marking Scheme)

Oct/Nov 2011 Paper 2 Variant 21
Q18c HOW TO DO?
Question paper: http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w11_qp_21.pdf
Marking Scheme: http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w11_ms_21.pdf

Oct/Nov 2011 Paper 2 Variant 22
Q13b, Q18b HOW DO YOU DO EM?
Question Paper: http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w11_qp_22.pdf
Marking Scheme: http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w11_ms_22.pdf

HELP NEEDED....URGENT!!
 
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How do we draw the line of best fit in corelation questions
and wen they say to draw histogram we always find frequency density

If you have many points close together, the line passes roughly through them...but it is not always necessary that the line passes through all the points...it could pass through a maximum number of points or roughly between them.
If the class width is different for the intervals, you should find out frequency density for histograms.
 
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A bus leaves a port every 15 minutes, starting at 9:00. the last bus leaves at 17:30. how many times does a bus leave the port during one day?

The time difference between 17 30 and 09 00 is 8hrs 30mins. Convert this to minutes so you will get 510 minutes (8.5 x 60). 510/15=34. But the last part says that another bus leaves at 17 30. So 34+1 that gives you 35 times. Let me know if the answer is right (check marking scheme for reference)
 
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The time difference between 17 30 and 09 00 is 8hrs 30mins. Convert this to minutes so you will get 510 minutes (8.5 x 60). 510/15=34. But the last part says that another bus leaves at 17 30. So 34+1 that gives you 35 times. Let me know if the answer is right (check marking scheme for reference)
it's correct thanks alot, I'll be asking you more question if you don't mind
 
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Im sick of solving past papers !! .. and i hardly get answers correct .. i don't know what to do !!.. on 6th may means only 6 days left i have my exam .. and now my situation is awful !!. please suggest me anything to score good marks !! please !! ...
hey bro dont give up :D i also didnt get any marks in the start. u got 6 days. do 10 pprs per day :D
just keep solving. after a ppr mark it urself. any problems discuss with some1. if possible u can post it here :D
just dont worry pray to Allah and Insha Allah u'll get A* :D
 
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http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s03_qp_2.pdf
In question 18, they are asking for the scale in from 1:n
Where AB is given 100m.

What I thought,
Since 1m = 100 cm
then 100m = 10,000 cm.
Which is not correct, unfortunately.
first of all, it says the diagram is drawn to scale.
then, 100 metres is the original length, the actual length of AB.
but it never said 1 on the diagram represents 100 metres :D
the length of AB in the diagram represents 100 metres in actual. :D
so u have to measure AB with a scale and u will get 10 cm.
this means 10 cm on this diagram represents 100 metres in actual :)
now 100 metres = 10000 cm

10:10000
so it should be in the form "1:n"
so therefore, simplify 10:10000 and u get this:
1:1000
did u understand or not? :D
 
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