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NEXT QUESTION: this one had me thinking for a while...... Q - five persons play a card game in which one pair play against the other pair. the fifth person acts as referee. in how many ways can this occur? btw - how do you make a spoiler?

i seem to recall ive done this question before....somewhere i) as t -> infinity, ce-1000t->0, then P->1000 ii) if t=0 and P=1, then c=999. put P=500, then 999e-1000t=1, then t=[ln(999)]/100=0.0690675...years=25.2days. so after 26 days 500 chivkens will be infected iii) on differentiating...

Re: Economics Marathon - The 2006 Version MER targets the supply side of the economy and aims at improving productivity, efficiency (A,T,D), and overall level of competitiveness - all on the industry level. puts downward pressure on inflation.... cant go on.

your right....what was i thinking that means because its a bent structure electron distribution is not symmetrical. there also exists a lone pair of electrons, which, i think is the reason for the polarity. sorry for confusing anybody

i dont know if your explanation is accurate.....but i thought it was just the fact that ozone provides greater surface area over which dispersion forces are created so there is stronger force of attraction, since water is polar and 02 and 03 are not, so the only van der waal forces that can be...

for the first one how do you know quad. POQR to be cyclic? also, does anyone have a link to a proof of the radical axis theorem? thanks for all the help

from fitzpatrick Ex. 37(a) (this exercise seems ridiculously difficult, i read through most questions and could probably do about 5, these are a few with which i had absolutely no idea) Q20. O is point on a given circle. A circle, centre O cuts this given circle at P and Q and a chord PR of...

assume the stat. is true for n=k Uk = 9k+1 -8k-9 = 64P , to use this make 9k+1 the subject then, U(k+1) = 9k+2 -8(k+1)-9 write this as 9.9k+1-8(k+1)-9 by...

sorry, im confused. just in regard to the practically of this, is it even possible to have 0.5g of sulfuric acid, isnt it only an acid when its dissolved, i mean you cant have a solid acid can you?

(ad-bc)^2>=0 then expand and rearrange to get a^2d^2+b^2c^2 >=0 then multiply throughout by -1 then add a^2c^2+b^2d^2 then factorise and rearrange kind of like what you did but the other way around

i think because when youve added the impurity it takes up part of the surface, thus preventing vapourised molecules to escape as easily, so a higher temp. would be required. not really surethough, just guessing, give some other BoSer's some time, theyll know

i thought it would have been the B, the atmosphere because it contains N2, O2, Ar which are all elements doesnt the lithosphere contain mainly compounds, like metal oxides and stuff. riviet, can u explain why you'd choose A thanks

"why do different elements produce different colours in flame tests" i thought it was basically because certain atoms/ions have differing distances between electron energy shells. so when an excited electron falls back from its excited state it produces energy of a different frequency, thus...

thats exactly the difference the dot says it is a radical, one electron away from a complete outer shell, these radicals (atoms) are rarely found in nature because they react so readily. on the other hand you have chlorine ions which are completely different to Cl radicals because these ions...

i agree, but the responses are way off to the point where its just darn funny

i dont know if this is relevant - i guess it is in a way. i found these CNNNN vids on youtube, titled stupid americans, its probably a bit of a sweeping generalisation, but anyway, some CNNNN correspondent is going around on the streets asking people questions about global politics, geography...

100 mini HSC's by John Smith is probably the best for practise and revision, heaps of very tough questions, particularly in the 4 unit version

so if some american retard decided to blow up some building in China, that would give China the right to invade the US?

QUESTION : on x^2=4ay, tangents at points P and Q intersect at S. given that p-q=1+pq, find the eqtn of the locus of S. ans: (y+a)^2=x^2 - 4ay QUESTION: on x^2=4ay, normals at P and Q intersect at N. given that chord PQ passes through (0,2a), find the locus of N ans:x^2=4a(y-4a)

no they dont