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IGCSE MATHS Doubts

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Ghost Of Highbury:

--- Quote from: xMilishax on May 12, 2010, 07:49:32 am ---Could someone pls explain this too? -->

Q18 a) - May/June 2003

http://www.freeexampapers.com/FreeExamPapers.com_.php?__lo=SUdDU0UvTWF0aHMvQ0lFLzIwMDMgSnVuLzA1ODBfczAzX3FwXzIucGRm

and Q15 - O/N 2003

http://www.freeexampapers.com/FreeExamPapers.com_.php?__lo=SUdDU0UvTWF0aHMvQ0lFLzIwMDMgTm92LzA1ODBfdzAzX3FwXzIucGRm

Thanks a lot! :)


--- End quote ---

q18a) measure the side AB with a ruler. 100m = 100*100cm = 10000cm. 10000/AB = n

15) bisect angle P. make the radius from T which is 90 degree to TP.  attached

Vin:

--- Quote from: Baladya on May 12, 2010, 07:56:43 am ---K isn't that what i said?? U don't even need to draw the lines inside. Just put the compass on B and open it to D, then rotate to the left until it will meet D'.

--- End quote ---

ok i didnt read wat u said .. n actually line BD is not required but still .. =)

xMilishax:

--- Quote from: A@di on May 12, 2010, 08:01:46 am ---q18a) measure the side AB with a ruler. 100m = 100*100cm = 10000cm. 10000/AB = n

15) bisect angle P. make the radius from T which is 90 degree to TP.  attached

--- End quote ---

Thanks a lot! :)

But the first answer is supposed to be 1000 :\  ???

Ghost Of Highbury:
ok u hav to give me a question to explain this..

y = 10x

x = log y

now, i know u guyz dont know log. but that is the answer, u have to give me a question like this one..

-------
Q : f(x) = 10x.
(a) Calculate f(0.5).

(b) Write down the value of f -1(1).

i dont get the "b" part
how do u find the inverse of 10x
----------------------------
Answer : if u havent learnt log. try this method

f-1(1) means, for what value of x in 10x will u get 1

answer = 0

for e.g f(x) = x+2

          f-1x = x-2

f(2) = 4

put 4 in f-1x and u shud get 2

4 -2 = 2

see?

simple

@xMilishax - Yes, 10000/AB shud be equal to 1000. Measure AB with ur ruler and do this calculation 10000/AB

xMilishax:

--- Quote from: A@di on May 12, 2010, 08:10:23 am ---@xMilishax - Yes, 10000/AB shud be equal to 1000. Measure AB with ur ruler and do this calculation 10000/AB

--- End quote ---

Ohh okay! But I get 8.5 cm when I measure, thats only because its not the original paper right? Otherwise I would get close to 10 I think :|

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