Science & Mathematics - 25 June 2007

hello, how does a lie detector test work? pls exlain.

2007-06-25 18:01:50 · 7 answers · asked by Anonymous in Engineering

.....is called its _____ track
(1) anomalous (2) evolutionary (3) life-line (4) t-tauri

2007-06-25 17:55:12 · 1 answers · asked by Girl 3 in Astronomy & Space

There should be two answers, I solved it and think they are: x= -4/5 and 2.

2007-06-25 17:53:06 · 9 answers · asked by Anonymous in Mathematics

find the derivative:
F(x)= 2x^3-1/x^2

2007-06-25 17:50:42 · 3 answers · asked by angel 1 in Mathematics

2007-06-25 17:49:39 · 4 answers · asked by Rave N 1 in Mathematics

2007-06-25 17:31:26 · 3 answers · asked by DELIANA A 1 in Biology

Obviously as we learned in grade school, Isosceles triangles have 2 equal sides
an equilateral triangle has all 3 equal sides, my question is
are isosceles triangles also equilateral triangles (meaning 2 side triangle also name for 3 side triangle) , or is an equilateral triangle also an isosceles triangle (a 3 side triangle is also a two side triangle?) i think i totally confused my self, a two side triangle is also a 3 side triangle or a 3 side triangle is all a 2 side triangle.
P.S. Or is an isosceles triangle a triangle of AT LEAST 2 sides?
I hope you understand what I'm taking about i know but yet ive totally confused my self, oh man i totally confused myself lol

2007-06-25 17:30:26 · 4 answers · asked by Anonymous in Mathematics

In my last question I did not intend to put forth a theory. I am trying to understand, and to distinguish what we know, and what theories there are.

So I say, it seems to me (not that I am holding to any of my assumptions, but for the purpose of questioning), that the universe can not have a shape because then photons would curve through space. Perhaps I am wrong. But then does the universe have a shape? If not then is it true that the universe has an envelope?

Actually we can not see 40 billion light years into space, such is based on assumptions. We can see 4 parsecs, and up to about 30 or 35 parsecs, but beyond that we can not tell distance.

2007-06-25 17:27:55 · 5 answers · asked by David L 4 in Astronomy & Space

3x^2-33=0

I think the answers are: sqrt11 and -sqrt11. Am I right? Could you also explain how you got your answer?

2007-06-25 17:24:24 · 4 answers · asked by Anonymous in Mathematics

Use the sales forecaster's prediction to describe a normal probability distribution that can be used to approximate the demand distribution. Sketch the distribution and how its mean and standard deviation.

Provided information: Sales forecaser predicts an expected demand of 20,000 units with a 0.90 probability that demand would be between 10,000 units and 30,000 units.

What is the standard deviation?

2007-06-25 17:22:15 · 6 answers · asked by toni.chang 1 in Mathematics

1. Sodium atoms can form NA+ ions in terms of electronics explain how a sodium ion, NA+ is formed from a sodium atom.

2. Neon and argon are inert gases, in terms of electron arrangement explain what this statement means

3. In which group of the periodic table would you place sodium.

2007-06-25 17:18:49 · 3 answers · asked by questioneer112 1 in Chemistry

2007-06-25 17:17:33 · 2 answers · asked by patrick t 1 in Geography

Please see this layman's pic, since trying to write it here is a hellish ordeal: http://img98.imageshack.us/img98/4360/reimennrl7.jpg

The first part is the actual problem. The second part, why is the problem split into two sums? Is it because the k below sigma in the first problem is = 3, and we have to set it to 1? I don't see the relationship, thanks!

2007-06-25 17:15:49 · 4 answers · asked by Jorm 3 in Mathematics

I have searched around and need help finding a source of inexpensive large (42X65) plexiglas sheets. Thanks.

2007-06-25 17:15:19 · 1 answers · asked by Figero 2 in Engineering

2007-06-25 17:13:49 · 18 answers · asked by pisces02 4 in Astronomy & Space

Susan invested part of her $18,000 bonus in a fund that paid 9% profit and invested the rest in stock that suffered a 3% loss. Find the amount of each investment if her overall net profit was $780.

I need to find:
*amount invested at 9% = $________
*amount invested in stock = $_______



Thanks for your help!

2007-06-25 17:10:41 · 6 answers · asked by DoWHATiDO 3 in Mathematics

2007-06-25 17:06:40 · 4 answers · asked by bomber fob 1 in Weather

2007-06-25 17:03:06 · 4 answers · asked by sikahunter 1 in Other - Science

2007-06-25 17:02:54 · 4 answers · asked by patrick t 1 in Geography

For example would a sound at 15,000 HZ travel faster than a sound at 60hz?

2007-06-25 16:57:25 · 7 answers · asked by Jeff B 2 in Physics

1) (x + 2y + 2z)sqare
2) (2x + 3y - 4z + 3w)square
3) (xsquare - 2x + 3)square
4) (2x + 3yz + w)sqare
5) (x + y - 3z)square
6) (x + y)to the 4th

please do include your solutions, I would really appreciate the helps. T_T

2007-06-25 16:57:14 · 6 answers · asked by MarkAngelo 2 in Mathematics

pls. answer this i need this for my report tomorrow.

2007-06-25 16:53:54 · 4 answers · asked by Charm 2 in Earth Sciences & Geology

2007-06-25 16:49:39 · 11 answers · asked by Anonymous in Medicine

Fresh water drain near to sea ,run of from the fields thats going to be let out to sea. the drain is full of fish people fish there regulary.during them summer when fields are dry local farmer fills tankers and takes to fields. sounds a good idea but at what cost to environment.

2007-06-25 16:48:34 · 17 answers · asked by Anonymous in Agriculture

2007-06-25 16:47:57 · 3 answers · asked by shygirl_019 1 in Medicine

2007-06-25 16:45:17 · 4 answers · asked by Anonymous in Other - Science

pls help me pls... give me the best explanation pls

2007-06-25 16:44:43 · 5 answers · asked by Yer 1 in Mathematics

2007-06-25 16:44:29 · 7 answers · asked by mike s 2 in Mathematics

I guess, in quantumelectrodynamics, there are probabilities for a photon to have velocities higher or lower than c, when measuring over very short distances. What does happen to the relativity stuff then?

2007-06-25 16:42:30 · 8 answers · asked by Anonymous in Physics

i mean the empirical formula i.e:H2O

2007-06-25 16:40:58 · 6 answers · asked by joshua y 1 in Chemistry