Science & Mathematics - 25 August 2007

Would you please explain to me how to get the answer of this problem.

( x + 2) / (2x^2 + 5x + 2) + (x - 3) / (2x^2 - 5x - 3)

2007-08-25 11:00:26 · 5 answers · asked by Gator Girl 5 in Mathematics

2007-08-25 10:58:09 · 4 answers · asked by Nicholas 1 in Other - Science

Similar to a previous problem I posted, I rewrote this problem and expressed it as thus:

[ ∫ 1/(1+x^2) + ∫ x/(1+x^2) ] dx

Then I remember that ∫ 1/(1+x^2) = arctan x

and so I came to

arctanx + [(1/2)∫ 1/(1+x^2)]

and I get

arctanx + (1/2)arctanx?

But the book is arctanx + (1/2) ln | 1+x^2 | + C

Again, why, in this case, would it be (1/2) ln | 1+x^2 | rather than (1/2)arctanx?

2007-08-25 10:55:57 · 5 answers · asked by ? 3 in Mathematics

how do you simplify this

2007-08-25 10:55:18 · 4 answers · asked by ? 2 in Mathematics

2007-08-25 10:52:08 · 5 answers · asked by Anonymous in Mathematics

I want to know if a glass smith, or anyone, or anything, can get rid of cracks in a mirror. I'd imagine no, but.. even though I don't know much about the subject, it seems like they could just melt parts of the glass so it bonds with itself again, then cool it off so it resolidifies as one piece with no cracks.. am I missing a key obstacle here or what? thanks.

2007-08-25 10:39:56 · 4 answers · asked by Super Shane 64 3 in Engineering

2007-08-25 10:36:41 · 7 answers · asked by ? 2 in Geography

the length of a picture frame is 3 in. greater than the width. The perimeter is less than 52 in. Describe the dimensions of the frame.

Solve the problem by writing an inequality.

2007-08-25 10:29:07 · 11 answers · asked by Anonymous in Mathematics

2007-08-25 10:25:56 · 16 answers · asked by Anonymous in Mathematics

I was watching tv and they said that earth was being controlled by George Bush and the queen of England. And they also said that they were lizards. Any one heard of USO's??

2007-08-25 10:21:33 · 10 answers · asked by Anonymous in Astronomy & Space

Given f(x)=x^4-7x^3-6x^2+8x+9.
Determine the coordinates of the lowest point at which the graph changes direction from decreasing to increasing.

2007-08-25 10:10:15 · 4 answers · asked by Anonymous in Mathematics

2007-08-25 10:06:20 · 4 answers · asked by Anonymous in Biology

2007-08-25 10:03:34 · 4 answers · asked by MathDunce 1 in Mathematics

Find all real zeros of the function to the nearest 0.001.
f(x)=x^3-x+6. Thank you so much. I appreciated it.

2007-08-25 10:01:06 · 2 answers · asked by Anonymous in Mathematics

2007-08-25 10:00:30 · 5 answers · asked by dogcutecat 2 in Mathematics

An ice world like Pluto, enceladus, or Triton may be a problem to land on with rockets. Ice might flash vaporize. What options are there?

2007-08-25 09:56:00 · 7 answers · asked by shysf 1 in Astronomy & Space

Excitation requirement (maximum) is 125KW, 210V. Can the short circuit ratio of this generator be calculated with the available information? If yes, what is the value?

2007-08-25 09:46:30 · 1 answers · asked by Owen E 1 in Engineering

its has to be a capital city

2007-08-25 09:42:59 · 9 answers · asked by Anonymous in Geography

What type of work does Marie curie do? Description please. I kinda already searched the net

2007-08-25 09:40:33 · 3 answers · asked by lol! It's moi 2 in Medicine

Still finishing the Science summer packet. Just need a little more help people. I need to know:

What are the three groups mammals are classified in?

How are the three groups of mammals classified?

To answers question number two you'd have to start off by something like, "In the first group mammals are classified by their..."
I ask again that I please get the answer insteadof just links. Thanks much ^_^

2007-08-25 09:29:42 · 2 answers · asked by The Girl With All the Answers 2 in Zoology

2007-08-25 09:29:06 · 6 answers · asked by Anonymous in Mathematics

Earthships are the houses built by using every kind of recycable product. Instead of cement foundation, they use packed tires and dirt ect. Also, what else do people who build these homes build? Thank you.

2007-08-25 09:25:23 · 3 answers · asked by Anonymous in Engineering

if human kind evolution is less than a lizard for example? why is man a earth dominate species

2007-08-25 09:22:22 · 10 answers · asked by Anonymous in Biology

can someone give me a good answer that relates to a scientific answer.

2007-08-25 09:21:59 · 2 answers · asked by Anonymous in Physics

sin²x + cos²x = 1

I don't get how sin² or cos² can be squared? Can anyone explain it to me?

2007-08-25 09:20:59 · 4 answers · asked by Kaz Wilkosz 2 in Mathematics

Is their a website where I can view electron dot structures of various atoms such a lithium, nitrogen, sulpher, etc.?

2007-08-25 09:17:46 · 1 answers · asked by Brian 4 in Chemistry

How far down can life survive?

2007-08-25 09:15:05 · 2 answers · asked by Balrog 2 in Astronomy & Space

You see dwarf people from time to time but i have never seen an animal with a big head and a little body, i mean i would love to know if anyone has ever come across a dwarf elephant!

2007-08-25 09:09:31 · 11 answers · asked by Anonymous in Zoology

are there theories or laws? i think the answers are L T L T (law, theory, law, theory).


1. water from a glass evaporated. T or L?

2. heat in the room caused the water to evaporate. T or L?

3. The lack of rain in the summer increases the risk of forest fires. T or L?

4. There are forest fires in the summer. T or L?




am i correct? please help!

2007-08-25 09:04:15 · 10 answers · asked by casaouia 2 in Earth Sciences & Geology

Use calculus to find the volume (in cubic centimeters) of a tetrahedron with three mutually perpendicular faces and three mutually perpendicular edges with lengths 3 cm, 4 cm, and 5 cm.

Volume = ? cubic centimeeters

2007-08-25 08:58:31 · 3 answers · asked by ohsnapps 2 in Mathematics