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Originally posted by gunner77:
errr... still confused
i don understand ur steps where u get 400%
For me i will just sub in X for any value, and then increase its value by 100% to get the %change in why
When we have X as 1, Y=1
Later we increase X by 100%, from 1 becomes 2 what. Since 100% is 1. Increase by 100%, means increase by 1. 1+1=2
As X is 2, Y =X^2 =4
Compare the two values of Y for % change
4/1 X100% =400%
Not sure if this is the standard method to get the answer though.
OH WAIT IT IS NOT!!!
Y=X^2
At 1st X is just..well X
If it increases by 100%, X+X becomes 2X.
With this new value, Y = (2X)^2 = 4X^2
(4X^2/ X^2) X 100% =400%
Which 1 u can understand better?
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Originally posted by gunner77:
ohh !! yaya !
how come i dint tink of tat?!
thanks
can u explain part B too?
i thought the equation should be y= Kx^2
K is the constant
yea y=kx^2
in this case k is 1 since they said Y is DIRECTLY proportional to X^2
pardon me if im wrong,nvr touch these concepts for a year alrdy... but that's how i interpret the question and will solve it la =x
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Originally posted by gunner77:
(a) solve the equation (2a-3)^2 = 16
(b) y is directly proportional to x^2
x is increase by 100%
find the percentage increase in y
a) Square root both sides
2a-3=4
2a=3=4=7
a=7/2=3.5
b)y=X^2
let X be 1
When X=1, Y =1
Let X be 2( Since increase by 100% as stated)
Y=2^2=4
4/1 X 100% =400%
Edit: Sorry for Part A i forgot got 2 answers
coz when u square root 16 u get -4 or 4
so when 2a -3=- 4, 2a=-1, a = -0.5
u sure is -1.5?
Edited by lpx88 13 Oct `08, 10:31PM
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Originally posted by jonchao72:
lol my A level chinese oral even worse
the examiners asked me if i thought Singapore was a fun place for tourists and why there is an occurence of SG ppl preferring to have their holidays out of SG and not in SG.
wad the fug.
That's the same qn the people taking chinese in my class kena lol
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I've seen obese people who can do drills. I think it's just a matter of practice and mindset. In NS obese people also have no choice but to do drills as well. So why they can u cannot?
U've alrdy said that ur weight is a problem. So jolly well go for the PT sessions and lose some weight. If not NS come u also die.
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