Science & Mathematics - 6 February 2007

I used the integrating factor method and got

d/dx (ye^x) = sin(e^-x) + (e^x)(cos(e^-x)) - e^(-x)

Now comes the problem, how do you integrate sin(e^-x) ?

2007-02-06 17:58:08 · 3 answers · asked by sky_blue 1 in Mathematics

need help understanding. Can someone show me an equation that is not a function? Thank You.

2007-02-06 17:54:43 · 5 answers · asked by Christ' Soldier 2 in Mathematics

Do you see the problem?

We are creating a reduction in diversity in the genetic pool

1. All of life
2. Humans
3. Human personalities

We are moving towards "blandness".

This is scary because earth conditions change slightly even over just 100's of years.

Do you see what i mean? Lets see how well you can guess my thoughts and articulate them.

Cheers!

2007-02-06 17:53:14 · 2 answers · asked by Anonymous in Biology

ok the question is....... g(x)= 2+ x + 4e^(x-2) , find g ^ - 1 (8)

so g^-1(8) =?

plz help me with this question

2007-02-06 17:52:21 · 2 answers · asked by Jenifer 1 in Mathematics

2007-02-06 17:50:36 · 4 answers · asked by prospero c 1 in Zoology

I need any kind of help as soon as you can..
mostly a pictures of it. if you can refer me to a helful web sites that I can gather information of it please give me..

2007-02-06 17:46:48 · 4 answers · asked by icestorm 2 in Engineering

To furnish a room one has to select 2 chairs and 2 tables from a collection of chairs and tables that are different from each other. If there are 5 chairs in the collection and there are 150 different combinations available, how many tables are there??

2007-02-06 17:46:13 · 3 answers · asked by rajagopal r 1 in Mathematics

if g(x)=6+x+8e^(x-4)

find inverse of g(18)

2007-02-06 17:41:51 · 3 answers · asked by Anonymous in Mathematics

When Neutral theroy says that Genotypic changes which occur most of them will not produce any phenotypic changes. So By only survival of fittest & natural selection & hypothitical isolated environment can evalution occur

2007-02-06 17:39:54 · 4 answers · asked by DR Umesh B 1 in Biology

For the function find the standard form, the vertex, line of symmetry, and the max or min value.......

f(x)= x^2+2x-5

2007-02-06 17:37:56 · 5 answers · asked by Rubyx 2 in Mathematics

2007-02-06 17:37:14 · 1 answers · asked by Chuck Dhue 4 in Chemistry

A student tries to observe a coin in an empty basin.The student cannot see the coin in the empty basin,but he can see the coin when the basin is filled almost to the brim with water.

a)Make one suitable observation

b)State a hypothesis that could be investigated

c)The aim of the experiment
d)Variables of the experiment

e)The procedure of the experiment which includes the method of controlling the manipulated variable and the method of measuring the responding variable

f)Conclusion

g)Precausion

Choose one or if you're really smart you can try all.

2007-02-06 17:36:31 · 3 answers · asked by blah,blah,blah 3 in Physics

Integrate the function: (6 * dy) / (sqrt(y) * (1+y))

I know the answer is 12 * arctan (sqrt(y)) + C, but how?

2007-02-06 17:33:41 · 2 answers · asked by Geoff M 1 in Mathematics

I think the last 15-20 years has seen advances in Internet, portables, telecommunications, genetic engineering..What do you predict in the next 15-20? Thanks for your input.

2007-02-06 17:32:22 · 2 answers · asked by Anonymous in Other - Science

i need some basic info on who he is and what he did!

2007-02-06 17:31:35 · 3 answers · asked by Anonymous in Other - Science

2007-02-06 17:31:22 · 7 answers · asked by nicstar 1 in Medicine

We can assume spacetime as being a flexible multi-layered trampoline,or a volume of some fluid,is'nt it?If this is true,then there is a CERTAIN amount of spacetime(in the universe)at a FIXED time,although this amount is tremendously large,which is why we SAY it to be limitless of infinite,as we will never be able to determine this CERTAIN amount.(I use the word FIXED as Hubble's Law says, universe is ever-increasing.)If this were true,we could say that spacetime is conserved at a PARTICULAR INSTANT OF TIME.So,my 1st question is that,could there be A LAW OF CONSERVATION OF SPACETIME?

If such a law could could be framed,then what it would suggest is that when a black hole is being formed,there should be a simultaneous formation of an 'anti-black hole' in order to keep spacetime conserved in all the infinitesimal time intervals during its formation.So,my 2nd question,which is a direct consequence of the 1st question,is that could there be anti-black holes, which we have not detected?

2007-02-06 17:28:52 · 8 answers · asked by Kristada 2 in Physics

i mean , i want to get more information about engineering technolgy at present

2007-02-06 17:24:21 · 3 answers · asked by deepak s 1 in Engineering

one side got E797 the other side 10

2007-02-06 17:23:06 · 3 answers · asked by Hollie31 1 in Medicine

2007-02-06 17:22:48 · 1 answers · asked by Mujahid E 2 in Biology

1) Benedict spent 2/9 of his pocket money on books, 2/5 of the remainder on magazines and saved the rest.
a) What fraction of his money did Benedict save?
b) If he spent $16 more on the magazines than on the books, how much did he have at first?

2)There were 1800 farm animals consisting of cows, goats and chickens in the ratio 5:6:9. When the farmer bought 297 new farm animals, the number of chickens increased by 20% and the number of goats increased by 10%. What was the new ratio of the three types of animals?

3.Potatoes are kept in 3 sacks, A,B and C. The mass of potatoes in Sack A is 3/5 of the mass of potatoes in Sack B. If the total mass of potatoes is 72kg, what is the mass of potatoes in Sack C?

4. In preparing mixed nuts, Roslan mixes 24g of cashew nuts, 12g of almonds and 44g of peanuts. If he needs to prepare 3kg of mixed nuts, what is the mass of peanuts required?

Thanks!

2007-02-06 17:22:39 · 3 answers · asked by Anonymous in Mathematics

if you can help me figure out the problem i have no idea how to work it out please help

2007-02-06 17:22:08 · 4 answers · asked by wokkie1234 2 in Chemistry

A block of mass 2.5kg is pushed 2.20m along a frictionless horizontal table by a constant 16.0 N force directed 25.0 degrees below the horizontal. Determine the work done by (a) the applied force, (b) the normal force exerted by the table, (c) the force of gravity and (d) the net force on the block.

2007-02-06 17:20:08 · 3 answers · asked by portraitofsound 1 in Physics

I have to do a little research on him. I dont want you to do all the work for me, but just guide me to some websites/books that are easy to understand, becuase all of the infomration that I have read so far is a little complicated for me.

2007-02-06 17:19:39 · 2 answers · asked by Delta-fan 2 in Chemistry

2007-02-06 17:12:56 · 8 answers · asked by lazyash 1 in Astronomy & Space

2007-02-06 17:10:55 · 2 answers · asked by tnoib 1 in Earth Sciences & Geology

Why do they exist? We don't talk to imaginary people, we don't have imaginary pets, or eat imaginary food...so why do we calculate imaginary numbers...and if there is a reason...who came up with the brilliant idea to name them "imaginary"!

2007-02-06 17:09:43 · 10 answers · asked by ♥ Yaz ♥ 2 in Mathematics

i dont understand proprtions.... like heres an example

a teacher has 54 research papers to read. she can read three of them in 40 minutes. how long will it take her to read all of the papers at the same rate.

can anyone explain how to do them??

2007-02-06 17:08:51 · 11 answers · asked by Anonymous in Mathematics

I don't understand!
My psychology teacher was telling our class today about how there are experiments going on with mice which have to do with targeting the pleasure center in the brain and stimulating it with electricity, thus creating a fake orgasm.

I don't understand what they mean by a fake orgasm!!!

Can someone explain this to me?

2007-02-06 17:08:29 · 4 answers · asked by Anonymous in Zoology

Because the moon was always lightin so the temporature normally more than 100. then how a common man can step down.

2007-02-06 17:07:07 · 12 answers · asked by Remya R 2 in Astronomy & Space