study first then you know lah ... they are related. after you study redox, you probably can understand electrolysis better.
this year, I might not teach Form 4 & 5, so ... good luck.

Nope ... that wasn't the case of my students. They all happy to thank me for the prediction

use log base 2

This post has been edited by work_tgr: Jan 17 2009, 07:07 PM

what is the answer for n ?
with that value of n, can you get the answer of 2^12 ?

This post has been edited by work_tgr: Jan 17 2009, 07:26 PM

I don't think the problem is from the subjects, it's you having some problems in learning. When I was taking SPM, I also hate add maths as I fail to understand most of the formula. It was too hard for me! Then, I get poor result in add maths. Now, when I think again about it. I realized that I had something troubled me at that time. I couldn't concentrate into study and that was why I get the poor result.

Sort out your problems and solve it first before change your interest into study.

This post has been edited by work_tgr: Jan 19 2009, 07:20 PM

ar^4=2/81 -->(1)
a(r^2+r^3)=8/27
ar^2(1+r)=8/27 -->(2)

solve it ... *I think so*

(1)/(2)
r^2/(1+r)=4/3
3r^2-4r-4=0
(3r+2)(r-2)=0
r=2

This post has been edited by work_tgr: Jan 19 2009, 08:02 PM

too bad then ...

create two equations and solve .... like the previous one

I see no difference.

then, the question must be "the rate at the 120th second". *no need to mention average*

f(a)=|3(a)-1|
5=|3a-1|

5=3a-1
a=2
@
-5=3a-1
a= -4/3

yeah, two answers.

give both answers.
tips: if the question say "possible values", then it must be more then 1 answer.

This post has been edited by work_tgr: Jan 21 2009, 12:23 PM

should be two answers, unless the question has mentioned the range of a.

as what milleu said, since the question is asking you to sketch.

f(x)=|x-3| in the domain -2(<=)x(<=)4.
f(-2)=?
f(-1)=?
f(0)=?
f(1)=?
f(2)=?
f(3)=?
f(4)=?
then sketch.

Another method is sketch first f(x)=x-3

Then "mirror" all of the negative value for f(x) to the positive side (upper side of cartersian graph)

This post has been edited by work_tgr: Jan 21 2009, 04:55 PM

y-axis is f(x)

can.
another method is to make 2 equations of SOR and POR, then solve them simultaneously

that equation is b^2-4ac=0

0.000047+0.00019=0.000237

75000+8700=83700

Nobody can confirm if periodic table is given in SPM, but the chance is high.

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Added on January 28, 2009, 12:49 pmQ1=> divided 2
Q2=> not sure, u should refer to the chapter about salt
Q3=> I think all can (not sure)

This post has been edited by work_tgr: Jan 28 2009, 12:49 PM