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MAth4 help

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madikay:
@eddie_adi619
can you please help me with the sequence questions for question (9)(b) i have attached the file

Ghost Of Highbury:
yeah sure..
heres your answer..
but before that use this formula for all sequences question - a+(n-1)d + 1/2(n-1)(n-2)c
where a is the 1st term
         d is the difference between the 1st and the second term
         and c is the final difference (find the difference of the difference until u get a constant value)

i) if there is a constant difference use a+(n-1)d => 7 - 2n +2 = 9-2n
ii) if u clearly see its the cube of the term...like the 2nd term has 8..the third term has 27...therefore - n cube
iii) if u see properly you will notice that the numerator = to the term and denominator is +1 of the numerator
therefore it is n/(n+1)
iv) (n+1) the whole square
v) 3 raise to (n-1)
vi) it is the sequence of (iv) - (v)
therefore (n+1) the whole squared - 3 raise to (n-1)
good luck

Ghost Of Highbury:
okk now for the big one...Q7.c) from paper 4 2001 oct/nov
asked by "zara" and "priceless"
sry for the delay
heres your answer

7.c.) i hope you have already found the volume of the cylinder, the hemisphere and the cone in the previous question
        taking the radius as 5cm, height of the cylinder as 5cm, and  the perpendicular height of the cone also 5 cm..
you get the volume of the hemisphere as - 523.5987
           the volume of the cylinder as      - 392.699
           the volume of the cone    as       - 130.899

as we are unaware of the mases..v take their volumes previously found out to get the ratio
first..relate the volume of the hemisphere, the cylinder and the cone to the volume of the cone as it is the least ...

the ratio of the volume of the hemisphere to the volume of the cone
i.e 523.5987/130.899 = 4
the ratio of the volume of the cylinder to the volume of the cone
i.e 392.699/130.899 = 3
the ratio of the volume of the cone to the volume of the cone is obviously 1

therefore the answer is 4:3:1
hope my method is correct
if anyone has a better method...plz suggest
good luck
thank You

Ghost Of Highbury:
okk guys..i'm signing off now...i'll get back tomorrow morning now..
i gotta see the spanish premier league
la liga

k..everyone
night
hope all my answers are correct!!
happy to have helped u all!
Good bye

zara:
nite adi....
n m happy dat ur a member hea!!!

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