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  1. always-smile :)

    Mathematics: Post your doubts here!

    take 9 and 3 out of the equation to bring it back to its previous form then multiply all by 27 which is 9 by 3 you can check it if you make substitution with values of r and h in both equation (( i mean 1/3 x pie x 9r^2 x 3h and 1/3 x pie x r^2 x h x 27 )) and it will give you the same answer
  2. always-smile :)

    Mathematics: Post your doubts here!

    that's fine :D
  3. always-smile :)

    Mathematics: Post your doubts here!

    q7 c i ) use the same formula of volume of cone but use (3r)^2 instead of r^2 and use (3h) instead of h it will be --> 1/3 x pie x (3r)^2 x 3h ---->1/3 x pie x 9r^2 x 3h -----> notice that --> 1/3 x pie x r^2 x h x 27 is equal to 1/3 x pie x 9r^2 x 3h SO equal 27 W c ii ) use the same way...
  4. always-smile :)

    Mathematics: Post your doubts here!

    i think i got it :p look at the pattern of the first seq.( 1,2,3,....) and the pattern given in the question which is ( 3,6,9,...) .... you will find that the difference between them that the first seq. x3 gives the second one ... SO ..... ---> P50 = 1275 (in the first seq) BUT IN THE SECOND...
  5. always-smile :)

    Mathematics: Post your doubts here!

    LoooL ok but there is no part IV in Q9 :p
  6. always-smile :)

    Mathematics: Post your doubts here!

    no need :)
  7. always-smile :)

    Mathematics: Post your doubts here!

    heeeeey calm down it's simple make an equation from the dimensions he gave you : (x+1)(x+2)/2=x^2 expand (x+1)(x+2) ----> x^2 + 2x+x+2 ---> x^2+3x+2 then make cross multiply ---> x^2+3x+2= 2x^2 ( -2x^2) ----> -x^2+3x+2=0 ( multiply - ) ---> x^2-3x-2=0
  8. always-smile :)

    Mathematics: Post your doubts here!

    make substitution : make n=1 --> a+b+1=3 (3=no. of lines ) make n=2 --> 8a+4b+12= 12 (12 = 9 + 3 ) the solve it sumil.
  9. always-smile :)

    Mathematics: Post your doubts here!

    take me with you plllllz :cry:... to drive us crazy :mad:
  10. always-smile :)

    LooL ..... thnx alot sis :) u r really so cute :P.... what's ur name ??

    LooL ..... thnx alot sis :) u r really so cute :P.... what's ur name ??
  11. always-smile :)

    i feel like a foolish and stupid person and i'm stressed out and then i have to go to another...

    i feel like a foolish and stupid person and i'm stressed out and then i have to go to another city 2moro 4 my exam and also i can't sleep and can't stop solving maths all over again :'(
  12. always-smile :)

    Mathematics: Post your doubts here!

    yup that's right :)
  13. always-smile :)

    Mathematics: Post your doubts here!

    he already gave you the rate
  14. always-smile :)

    Mathematics: Post your doubts here!

    i knw this question it's not a nice 1 believe me :ROFLMAO:
  15. always-smile :)

    Mathematics: Post your doubts here!

    r u studing phy or something??
  16. always-smile :)

    Mathematics: Post your doubts here!

    Aameen :) ...... i feel like i have 2 heads ..it's too heavy :ROFLMAO:
  17. always-smile :)

    Mathematics: Post your doubts here!

    LOOL me 2 i have both exams on monday :oops:
  18. always-smile :)

    Mathematics: Post your doubts here!

    this formula is not for maths :eek: this 1 for phy.
  19. always-smile :)

    Mathematics: Post your doubts here!

    w08 Q5 e
  20. always-smile :)

    Mathematics: Post your doubts here!

    did you knw how to get the distance due to east??
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