A LEVEL MATHEMATICS

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Length of projection-confused with whether to use cross or dot product

Posted by White Group Mathematics on November 28, 2016 at 4:40 AM Comments comments (0)



Hi Mr Koh it's XXX. I have a question for you:

 

 

Why did the teacher use cross product instead of dot product? Thank you.












 

The way the respective dot and cross product results arise are attributed...

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Need a maths tutor for final month before A Levels

Posted by White Group Mathematics on September 28, 2016 at 4:50 AM Comments comments (0)



Hi Mr Koh,



                   I chanced upon your website online and I'd really like to engage you as my private tutor. I'm currently a JC2 student studying in SAJC. I know this is very last minute, but I really do need the help; in summary,  I've tried really hard to work on my Math, however I really don't see any improvements in my grades and I...

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Gradient of line and vectors

Posted by White Group Mathematics on August 26, 2016 at 2:25 AM Comments comments (0)



Hi Mr Koh,

                


                     I can't seem to get around this problem, could you please help? :/


                 

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Conics and applications of differentiation

Posted by White Group Mathematics on February 13, 2016 at 9:05 PM Comments comments (0)



I am having considerable difficulty grappling with this OCR problem. Could you kindly assist?









Student X















Worked it ...

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Integrating cosec ^4 x wrt x

Posted by White Group Mathematics on February 2, 2016 at 6:00 AM Comments comments (0)


I was given some basic calculus revision questions to do for an undergrad module, but since there's nothing new in them, so I decided to give these questions an A-level tag. I've been working on them for a while now, but I'm stuck at this. Any help would be appreciated; I'm not particularly bothered if you want to post the answers as it's not an assessed homework, and I'm starting to get tired of these. :/


Student X





...

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Poisson distribution approximated to normal distribution: Supply and demand problem

Posted by White Group Mathematics on January 24, 2016 at 11:50 AM Comments comments (0)

 


Sales of cooking oil bought in a shop during a week follow a Poisson distribution with mean 100. How many units should be kept in stock to be at least 99% certain that supply will be able to meet demand? Use normal approximation to Poisson distribution, if appropriate.


 

 

 

I have already approximated the distribution to Y ~ N (100, 100). Then, I have tried to use P(Y>y) = 0.99 . That didn't work so I...

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Locus of points equidistant from x-y and x-z plane

Posted by White Group Mathematics on November 4, 2015 at 10:10 AM Comments comments (1)


Hi Mr Koh,


                  I am unsure how about how the solution for part (a) is formulated. Could you please help?


                   

      ...

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Discovering vertices of a rectangle in an Argand diagram

Posted by White Group Mathematics on August 4, 2015 at 9:40 PM Comments comments (0)


Hi Mr Koh,




                  How do I do this question- In an Argand diagram, the points A, B, C and D represent the complex numbers a,  -2+5i,  c   and  3/2 - 1/2 i   respectively. Given that ABCD is a rectangle described in the clockwise sense with BC=2AB, find a and c.





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Discerning winning probabilities in national lottery

Posted by White Group Mathematics on July 19, 2015 at 10:40 PM Comments comments (0)


Hi,

 



Here in my country, when you buy lottery tickets, you try to guess the six (6) combination of numbers out of 42 numbers. Unlike in Sweepstakes, the order of numbers does not really matter.


 




http...

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Tiny abstract vectors problem

Posted by White Group Mathematics on July 14, 2015 at 10:25 PM Comments comments (0)


Hi Mr Koh,



                   I encountered this question. It says: if  a = (a • b) b, where a and b are vectors, what are the possible angles between a and b?  Also, what is the magnitude of vector b?





Student X

 






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