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Mathematics: Post your doubts here!

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

doubt 2.jpg

please explain me the answers

Pure maths---- P1----may/june 2010 variant 12!!!
 
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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
w10_q5.jpg

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
 
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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
 
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another question i hav a doubt

doubt 3.jpg

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

Thank you!
 
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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 :D
thanks
 
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Im having a doubt too...Oct/nov 2011 p33 q9iii)

12.jpg

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

Dug

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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.
 
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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?
 
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