Science & Mathematics - 15 February 2007

Hi, you guys are great help.

I'm reviewing for an exam I have in a few hours (it's costing me sleep, but I guess it's worth it), and I'm using a review "packet" which apparently has the same "format" of questions as on the actual test. (So in other words, there will be different values, but same set-up) Anyways, I've completed a few problems and I'm hoping if some of you can check 2, and show me how to do some others. Thanks.
I'm sorry if it seems like I'm overkilling it by including more than one question, but apparently I'm running out of questions I can ask.


Problems I've done, and need checked:
1) Integral of e^(1/x+1)/(x+1)^2 dx

For that, I got -e^(1/x+1)+c

2) Integral of 1/(x^2)(e^(2/x))dx
For that, I got -1/2(e^-2/x) + c

Questions I need full assistance with:

3) Evaluate Integral of e^x/(e^x + 1)^(1/2) dx

4.) Evaluate Definite Integral 1/x-1 dx; b(top):e+1 a(bottom):2

Thanks.

2007-02-15 21:30:16 · 1 answers · asked by Linguistic 2 in Mathematics

2007-02-15 21:29:34 · 3 answers · asked by parth2004 3 in Astronomy & Space

3x+7=4x(-3x)

2y+3=5y(-2y)

thanks!!

2007-02-15 21:23:08 · 1 answers · asked by Anonymous in Mathematics

i meant that how it produce sound when water vapours hit each other in the form of clouds?

2007-02-15 21:22:00 · 7 answers · asked by Anonymous in Earth Sciences & Geology

2007-02-15 21:21:14 · 4 answers · asked by parth2004 3 in Astronomy & Space

What is the advantage of a 2-beam Spectrophotometer?

2007-02-15 21:20:34 · 1 answers · asked by jenstarr 4 in Physics

What is the electrode potential for Cu2+/Cu+?

Cu+ + e- = Cu + 0.521V
Cu2+ +2e- = Cu + 0.377V

2007-02-15 21:19:47 · 1 answers · asked by jenstarr 4 in Chemistry

2007-02-15 21:17:56 · 1 answers · asked by parth2004 3 in Mathematics

2007-02-15 21:12:59 · 24 answers · asked by alisha 1 in Biology

2007-02-15 21:10:22 · 3 answers · asked by tallthatsme 4 in Physics

http://i134.photobucket.com/albums/q103/thepresident022/mh.jpg

There's a link if you wanna' see it just how it's in the book, or

x^3-1
-------------------
x^3+x^2+x


Ok so far I've hypothesized that maybe you factor an x out and so it would look something like
x(x-1)(x+1)
---------------------
x(x^2+x+1)

But maybe that's wrong? I can smell the answer, but I just can't seem to get it. Any help?

2007-02-15 21:08:23 · 6 answers · asked by Anonymous in Mathematics

2007-02-15 21:02:30 · 15 answers · asked by navneet b 1 in Chemistry

2007-02-15 21:00:58 · 5 answers · asked by parth2004 3 in Astronomy & Space

2007-02-15 20:57:32 · 4 answers · asked by alisha 1 in Biology

I have heard that the Wall is the only man made objecct visible from Earth

2007-02-15 20:56:20 · 11 answers · asked by robert g 1 in Astronomy & Space

2007-02-15 20:54:11 · 7 answers · asked by parth2004 3 in Astronomy & Space

Out of a number of Saras birds, 1/4 th the number are moving about in lotus plants , 1/9 th coupled(along) with 1/4 th as 7 times the square root of the number move on a hill , 36 birds remain in bakula trees . What is the total no. of birds.
Ans=576( The question is taken from a practise guide for exam namedHFI EDUCATION TODAY FOR IX-X PUBLISHED IN FEB-2004 >

2007-02-15 20:54:02 · 1 answers · asked by tula35jsr 1 in Mathematics

2007-02-15 20:53:09 · 2 answers · asked by ramin 1 in Physics

2007-02-15 20:46:51 · 2 answers · asked by ArskElvis 3 in Engineering

2007-02-15 20:45:14 · 3 answers · asked by Anonymous in Chemistry

Out of a number of Saras birds, 1/4 th the number are moving about in lotus plants , 1/9 th coupled(along) with 1/4 th as 7 seven times the square root of the number move on a hill , 36 birds remain in bakula trees . What is the total no. of birds.
Ans=576( The question is taken from a practise guide for exam namedHFI EDUCATION TODAY FOR IX-X PUBLISHED IN FEB-2004 >

2007-02-15 20:44:24 · 4 answers · asked by tula35jsr 1 in Mathematics

2007-02-15 20:44:19 · 4 answers · asked by Anonymous in Engineering

I have a 230V, 2 phase (Ph-Ph) power supply and no neutral or ground wire is available.

Can I run the motor without any harm? Give reason in support of your reply.

2007-02-15 20:36:12 · 7 answers · asked by Bishu 3 in Engineering

2007-02-15 20:32:25 · 16 answers · asked by navneet b 1 in Geography

we are the manufacturer of bronze filters and we are engaged with doing the brazing job works. So like to know those companies who required bronze filters and brazing job works.

2007-02-15 20:31:40 · 1 answers · asked by Maqbool A Ansari 1 in Engineering

2007-02-15 20:29:03 · 3 answers · asked by yash_pal61 1 in Engineering

2007-02-15 20:23:12 · 5 answers · asked by sindhukumar 1 in Engineering

2007-02-15 20:21:11 · 21 answers · asked by parth2004 3 in Astronomy & Space

2007-02-15 20:19:55 · 11 answers · asked by bharatbhai n 1 in Geography

Hi, I need help. I'm not sure what I'm supposed to do in this problem. Any type of help appreciated.

The Question: given f(x) = (2x-1)^1/2 find f^-1(x)

2007-02-15 20:17:52 · 5 answers · asked by Linguistic 2 in Mathematics