Mathematics: Post your doubts here!

[farhan143]

i am not able to answer this question!!!!!



please explain me the answers

Pure maths---- P1----may/june 2010 variant 12!!!

 

[SUMMERLOV35]

I'm sorry for bombarding the thread... My exam's after tomorrow and there's no one/place but here to help...
O/N 10 paper 12 question 5

Please help if you have the time I would really appreciate it

You have to use the sum formula
Sn=n/2 (2a+(n-1)d)
in this case n is m
m/2 (2x161+(m-1)x-7)=0
322-7m+7=0
7m=329 m=47

(b) in geometric progression the sum of n terms formula is
a(1-r^n)/(1-r) and sum to infinity formula is a/1-r
s0 this becomes

a(1-r^n)/(1-r)<0.9 a/1-r as sum of n terms <90% of sum to infinity

 

[umarashraf]

salam can someone help with question 1
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_13.pdf

mate open the formula sheet and follow the first formula used there for expansion... 5C2[k]^3[1/3]^2=30 and solve this... k=3.. i thinks its the answer...????

 

[SUMMERLOV35]

mate open the formula sheet and follow the first formula used there for expansion... 5C2[k]^3[1/3]^2=30 and solve this... k=3.. i thinks its the answer...????

exactly why is it k^2 in ms and why not k^3???

 

[umarashraf]

i dont have marking scheme.. but what is the answer..??? by k^3 its comes 3...

 

[SUMMERLOV35]

how?? im not getting 3 at all ?? answer is 3 though...
http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w11_ms_13.pdf

 

[umarashraf]

i am not able to answer this question!!!!!

View attachment 8613

please explain me the answers

Pure maths---- P1----may/june 2010 variant 12!!!

for the first part... take the first derivative... then put that equal to zero... put the value of x you have got into the real equation to get the value of y... i think it fx<2... for second. b^2-4Ac=0

 

[roadtrip9o9]

http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_s09_qp_1.pdf QUESTION 10 LAST PART ... Why dont we keep the negative sign with the root , how come it becomes positive :S ?

 

[umarashraf]

how?? im not getting 3 at all ?? answer is 3 though...
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_ms_13.pdf

10K^3 /9=30.... .. i have solved its twice now... its again equal to three...

 

[SUMMERLOV35]

10K^3 /9=30.... .. i have solved its twice now... its again equal to three...

oh im so sorry... i figured out the answer!
a careless mistake
anyways thanks!

 

[farhan143]

another question i hav a doubt



question part (2 ) i didnt understand explain me the answer any1.....

Thank you!

 

[omar hazem]

please I hope u will solve question 9)iii) nov qp 33 2011 mathematics A2 9709
but please as soon as possible because my exam is on 16 May
thanks

 

[tbug13]

already explained on pg86 post number 1707

Ohh thanks!

 

[aliya_zad]

Im having a doubt too...Oct/nov 2011 p33 q9iii)



Please help..!!
Vectors are soo confusing!!

 

[roadtrip9o9]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s10_qp_12.pdf .. last question .. the 2nd last and the last part wid da basic concepts plz thanks

 

[Dug]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_12.pdf .. last question .. the 2nd last and the last part wid da basic concepts plz thanks

You sketched the graph in part ii right?
Now consider the curve after x=1/2 pi, what do you see? It still can't have an inverse because the horizontal line test fails. The question says what is the largest value of x for which the horizontal line test succeeds. You should be able to work it out now.

 

[Dug]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_12.pdf .. last question .. the 2nd last and the last part wid da basic concepts plz thanks

For the last part, simply make x the subject to get g-1(x) and replace x with 3.

 

[roadtrip9o9]

the highest value is coming as pi ... not 1.5 pi in the 2nd last part :/

 

[roadtrip9o9]

i mean the higest value for it to have an inverse is coming as 2 pi .... not 1.5 pi as in the mark sceheme :S .., plus http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w09_qp_11.pdf how do we draw the 'line' in question 2 and what does the mark scheme mean by the curve flattening at pi :S ?

 

[PhoenixAsh12]

My exam is tomorrow... Can someone pleeeeease try and solve these? The pictures of them is on page 114 reply #2261
m/j 09 paper 1 question 10
MJ 07 paper1 question 6- how to find D? I know we find the lengh of BC then equate it to something?