Bryn

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Meson

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1. quick simple question

Rearange to find x in terms of y and t, in simplest form. (assume $y+3t\neq0$) $y(y-x)=3t(3t+x)$ I have $x=\frac{9t^2-y^2}{3t+y}$ Is this the simplest form?
2. thanks for all the fish

Just likes to say thanks to you lot for answering my dumb (and sometimes intelligant) questions on the maths forums over the last few months. Thanks to you lot I may just get the B I need to get into Bristol uni (to do Biochemistry, not maths thankgod).
3. Have I got this right?

why not just put $Ba(OH)_{2(s)} + (aq) \rightarrow Ba(OH)_{2(aq)}$. Far simpler and does exactly what is says on the tin.
4. Science VS Nature

I tend to prefer Nature, for generally better written articles, tho i do read articles from both.
5. a couple of trig questions

i did, what do i do with it once i got it in the form 2(cos x cos 50-sin x sin 50) = sin x cos 40 + sin 40 cos x?
6. a couple of trig questions

won't be too many more question, got my last maths exam monday but you help would be much appreciated. Solve for $0 \leq x <360$ $2cos(x + 50)^o = sin(x + 40)^o$ and $2cosx+sinx = 5$
7. can some one prove this please

i just spent the last week working on this kind of trig (it's a barstard) so lets see if i can remeber. .. nope damn well forgoten it, i'll get me coat.

If it involved sending making a copy of the human and then destroying the origanal i don't count that, proper teleportation has got to involving moving the origanal, not making a copy and then destroying the origanal.

ah ok i get.
10. need a graphical calculator program that does volumes of revolution

yes i'm trying to do it by hand, but the book i'm working from is riddled with mistakes, i dunno if i'm doing it wrong or if the book is giving mostly wrong answers.
11. need a graphical calculator program that does volumes of revolution

exactly as the topic says... any ideas plz?
12. intergration of e and 1/x

why does e intergrate to ex? $e^x$ intergrates to $e^x$ and as $e = e^1$ surely the intergral of e is also e?
13. intergration of e and 1/x

I've got this question i'm somewhat flumexed with. $\int_{e}^{e^2} \left(\frac{5}{x} + e\right) dx$ What've i've tried is as follows $\int_{e}^{e^2} (5x^{-1} + e) dx = [5ln|x| +e]_{e}^{e^2}$ $= (5ln(e^2) + e) - (5ln(e) + e)$ $= (5(2) + e) - (5(1) + e)$ $= (10 + e) - (5 + e)$ $= 10 + e - 5 - e$ $= 5$ which evan i can see from just looking at the graph is wrong, but for the life of my i can't see why. I'm sure i've got everything right after the intergration, but i'm almost just as sure that've i've intergrated it correctly. Any help much appreciated.