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I don't think you have to go into the nuances of PPP - just know what it is (an adjustment for the buying power of the currency in each particular country). It's not mentioned in the syllabus, and it's only briefly mentioned in Leading Edge with the stuff on GNI. :) I_F

SonyHK's correct. Each of the numbers from 89 down around to 173 multiply by 3 and add 1 to get the number opposite to them in the circle. Therefore the missing number is 757. For future reference, this type of question should be in the Appreciating the Beauty and Elegance of Maths forum. :) I_F

Most Enjoyable to Least Enjoyable 1. Maths (2U and 3U) 2. Chemistry 3. Maths (4U) 4. Physics 5. Economics 6. English Strongest to Weakest 1. Maths (2U + 3U) 2. Chemistry 3. Physics 4. Economics 5. Maths (4U) 6. English I_F

Soulsearcher, you're not quite right. But since the question was a little badly worded, that's OK. :p Next question: Find the exact length of the line from the point (2,7) to the centre of the circle x2 + 4x + y2 - 6y - 3 = 0 I_F

You want to buy about a billion smoke detectors? Go ahead - they only contain a tiny, tiny amount of americium-241 (we're talking small portions of a gram, I believe). But if you get enough of them, americium is a strong gamma emitter in gram quantities, so you'd have some power. I_F

Check out this thread here. :) I_F

I'm right with you there. I really didn't want the holidays to go so quickly... time just slips by so fast. :( I_F

*Checks Riviet's sig* It's 8 months, 4 weeks, and 1 day, and ticking down all the time. :( I_F

Once the marks out of 500 are found (total of the scaled marks in best 10 units), the top set of marks receives a UAI of 100, the next set get 99.95, etc. So I think a different number of people can get each rank - it depends on their aggregate scaled marks. I_F

It turns off if you select "Use Invisible Mode" in your options, I believe. I_F

I'm relying on a good all-round performance... as for a favourite, I couldn't really say... I don't really mind any of my subjects, but I wouldn't say I loved any of them. :p I_F

Please tell, why is the phrase "officially abandoned" incorrect? As far as I know, Brazil tried to adopt ethanol as their sole fuel, but it didn't work out, and they returned to shipping petrol. It doesn't mean they dissembled their ethanol production or distribution facilities, but they...

Off the top of my head, Turion 64 > Athlon-M > Sempron. Though Intel's Core Duo beats them all. I_F

I see no reason why facts from the 1970's and 1980's should be reported incorrectly in Conquering Chem. The Brazil experiment - the attempt to adopt ethanol as a sole fuel, failed, and petrol was reintroduced. However, Brazil maintained its extensive ethanol production facilities and transport...

Petrol is composed of short-chain hydrocarbons (mainly octane, C8H18), and is produced from crude oil, a fossil fuel which is non-renewable. Ethanol is an alkanol, C2H5OH, and contains oxygen (which petrol does not) and can be produced through the fermentation of sugars, making it a renewable...

The X is at the second spike. The question tells you that the hydrocarbons come out in order of increasing molecular weight - hence, pentanol is the first spike, hexanol is the second, etc. I_F

You're confusing mass with weight. An object's mass is the amount of material it contains, and is measured in kilograms, grams, etc. However, an object's weight is the force exerted on it due to its position in a gravitational field. Weight is measured in newtons. For example, on the Earth's...

d/dx(√[2-x]) = d/dx([2-x]1/2) = -1/2(2-x)-1/2 d/dx(-1/2(2-x)-1/2) = -1/4(2-x)-3/2 = -1/4√(2-x)3 Is that what you get? I_F

I would recommend spending a little more money for a Pentium-M processor and at least 512MB of RAM. At $1999 or so, you should be able to get a 1.8Ghz processor, maybe better. :) I_F

If you want Vista compatible in a laptop, wait till October when Intel's 64-bit dual core laptop chips come out. It's not worth buying a laptop now for Vista - it'll be 6 months old by the time Vista comes out, and the specs you need mean you need to spend $2500+ at least. And when Vista does...