But the equation suggests a parabola?

You have a point and there is a numerical solution. The working of solution is all very straightforward even if it is a parabolic dome. However, without the actual graphical representation of the parabolic dome from maximR, I cannot validate the logicality of my result.

Here I'm trying to imagine the construction of the BASE of parabolic dome with radius 25 units. In construction, we usually specify the radius of the dome roof of a storage tank at the base of the dome. How do you feel we should address this?



Parabolic Dome


Elliptical Dome


Two storage tanks with dome roofs


This post has been edited by Critical_Fallacy: Jul 9 2013, 01:44 AM

What do your teachers talking about writing chemical equations with physical states ? If you don't write physical states, you get mark deducted ?

Any tips on Bina Ayat section for BM?

I always fail at this section

Ayat Aktif is advised to avoid mistake.

Not sure how to explain further. Just don't too short or long.

No you won't. For SPM you don't have to write the state of matters but for STPM, yes.

Ya but the problem for me is sometimes I don't even know what the word means

Nothing can be done except read more

This post has been edited by blacktubi: Jul 9 2013, 05:41 PM

There is only so much I can read per day

How to do ©? Ans is 2pi


Attached thumbnail(s)

yeah ... as what i heard as well, just to reconfirm, thanks

f(x) = x² + 3

Because the volume of the solid formed by rotating the line segment around y-axis, you need to convert f(x) to g(y).

The volume of the solid of revolution = π ∫ [g(y)]² dy

An arithmetic progression has 9 terms. The sum of the first 4 terms is 24 and *sum of all the odd number terms is 55* . Find

a.)the 1st term and common diff.
b.)the seventh term

The problem , I feel , is the wording of the question ( marked * ) .
By odd number terms , does it say T1 , T3 , T5 , or the actual numbers themselves ? If it's the former than I may have to re-consider my understanding of the term "term" in progressions .

Example , an A.P may consist of 2 , 3 , 4 , 5 , 6 ...

Are the odd number terms 3 , 5 , ... or T1 = 2 , T3 = 4 , ...

So, do you have any idea?

Here is the sequence, but you do the maths.

3, 5, 7, 9, 11, 13, 15, 17, 19

Hi jonoave,

This is related to the Additional Mathematics Project Work 2013 (Penang).

As a seasoned biologist, could you advise me as to counting individual plant effectlively in swad of Mimosa pudica (see pics) using quadrat sampling technique, without digging up the roots?

Are the plants that touch the edge of the quadrat counted “in” or “out”?

Ehehe.. I wouldn't call myself seasoned biologist.

I'm really not that well-trained in fieldwork. Last I can remember related to this is labwork where we had to count hematocytes on a microscope slide.

If I remember correctly, we were told to ignore all cells that passes the edge of the slide. I suppose that is to avoid the guesswork and bias on how "much" of a cell needs to be in the slide that you can count it in or whether this cell should not be counted if it's ~50% out of the slide.

But we also have bout 3 slides each from different areas of the tissue/samples (to avoid bias if the cells were clumped together or scattered in a particular area). We took the average of the 3 slides.

Thanks for your explanation.

Actually, I'm having trouble to do the plant count. Shall I identify the individual plant by the primary stem? (See Table 1).

Again, I'm not an expert. But I do agree that identification by primary stem seems like a good idea.

Wow, SPM has sure changed a lot since way back when I took it. Why are you doing SPM questions?

Because my cousin asked for the practical advice in counting individual plant from a swad of Mimosa pudica. Thanks, anyway!