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Mathematics: Post your doubts here!

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Thank you very much. :) On the contrary can u also clear another o my small doubt????

when we are to find the acute angle between planes or between lines. we just subtract the ans (theta ) sometyms by 180, sumtyms by 90.
I cannot understand this????? how shud we know that whether to subtract from 180 or 90 ???? can u help here ??/
he canany one ans this please????
 
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agrrrrrrrrrrrrrrrr...........I just hAted the pAper today....wass quite tough and tricky...!! :( :/
The dream of getting an A is fading day by day....:( :'( :( myyyy gOd....Im in a state of DISRUPT....!!
im totally lost....!! :( lets just hope that the S1 paper will be ok....!! :(
bAd dAy---->>><<
 
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agrrrrrrrrrrrrrrrr...........I just hAted the pAper today....wass quite tough and tricky...!! :( :/
The dream of getting an A is fading day by day....:( :'( :( myyyy gOd....Im in a state of DISRUPT....!!
im totally lost....!! :( lets just hope that the S1 paper will be ok....!! :(
bAd dAy---->>><<
32???
 
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am i the only one who found 32 very difficult and left almost 30 marks? :'(

lol, ur not, u saw hw many questions i wus busy answereing on this forum, and I think i left out just as many as u.. bt remember that method marks count for everything and the final answer only usually counts for 1 mark
 
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yup...i did....n it wsnt good...wbu???
hmm.. it was good.. I didn't have enough time to finish qn 7.(ii), and for qn 7.(i), I just realized the method and the working at the very last minute, so, I had to rush until the invigilator took my paper.. :/
 
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3 A sample of 36 data values, x, gave Σ(x − 45) = −148 and Σ(x − 45)2 = 3089.
(i) Find the mean and standard deviation of the 36 values. [3]
(ii) One extra data value of 29 was added to the sample. Find the standard deviation of all 37 values.

how to do the second part?
 
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