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Mathematics: Post your doubts here!

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the one that is quoted in his question
the equationi formed in the first part is
y=e^15(e^(-2t))+ln70)
now we know the inital mass is 70 so
p=(the long equation quoted above/70)*100
as t==> infinity p==> 1 :) there u go
How do we get 100/e ? (ans)
 
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upload_2014-5-15_14-22-4.png

I got the answers (pie)/12 and 5(pie)/12

but why do they say in the marking scheme
upload_2014-5-15_14-23-15.png

why (pie)/2 ???
what am i missing here...??
 
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How is this years May June paper going to be?
October November 2013 was definitely a killer
Any expectations for our paper?
 
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