Qualification > Math
IGCSE MATHS Doubts
haris94:
it is the same actually
Vin:
sorry nets really responding slow .. !! >:( >:( >:( >:( >:(
im not quite sure about Q11 n Q14(b) .. they dont match my answers from the ms.. ??? ???
19 b)
9999 = 104 - 1
theres a rule (a2 - b2) = (a+b) (a-b)
so, (102 + 1) (102 - 1)
now if u notice (102 - 1) also falls under the above rule ..
(102 + 1) ( 10 +1) (10-1)
101 x 11 x 9
they hav asked 'as a product of prime factors.'
so tht would be
101 x 11 x 3 x 3
Q22 (b)
if u see it forms a right angled triangle
OA and AB are 15 each .. thrice p/w
so by Pythagoras ..
OBsup]2[/sup] = 52+52
OB = 21.2
Fastal:
14b
x=230 and 310.
continue the sine curve on theleft side of the graph they gave. this tells you that the curve from 0 to -180 is the same as from 360 to 180
thus 360-50
and 180+50
11b-dont really understand
Adzel:
--- Quote from: Fastal on May 11, 2010, 02:38:03 pm ---14b
x=230 and 310.
continue the sine curve on theleft side of the graph they gave. this tells you that the curve from 0 to -180 is the same as from 360 to 180
thus 360-50
and 180+50
11b-dont really understand
--- End quote ---
I did the same thing but the mark shcheme said its wrong...???
Adzel:
--- Quote from: ~VIN1094~ on May 11, 2010, 02:28:54 pm ---
OA and AB are 15 each .. thrice p/w
--- End quote ---
I did not understand this part... :-\
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