Science & Mathematics - 17 December 2006

lxl=x if x is positive
lxl=-x if x is negative

can someone explain this?

2006-12-17 11:24:05 · 2 answers · asked by Anonymous in Mathematics

2006-12-17 11:24:03 · 3 answers · asked by Automaton 5 in Astronomy & Space

make 1000000 pennies fit into one penny?

2006-12-17 11:19:35 · 10 answers · asked by Anonymous in Astronomy & Space

Any sources and materials for the novice star gazer ?

2006-12-17 11:19:05 · 5 answers · asked by LongJohns 7 in Astronomy & Space

2006-12-17 11:19:03 · 5 answers · asked by Anonymous in Mathematics

im going by my knowledge that hail is a form of ice and snow is in the process of becoming ice. so wouldnt it make sense that in colder locations it would hail, because the temperature is around freezing point which in my logic means ice, and not-so-cold locations would snow because in my logic its not cold enough to form ice. ex hail in san diego, but snow in alaska, shouldnt it be the other way around?

2006-12-17 11:18:57 · 7 answers · asked by mOnKEymAn 2 in Weather

2006-12-17 11:18:20 · 11 answers · asked by Dave 1 in Mathematics

2006-12-17 11:17:02 · 4 answers · asked by Anonymous in Earth Sciences & Geology

cylinder?

2006-12-17 11:14:40 · 5 answers · asked by Dave 1 in Mathematics

this is just pretend but if life was found on mercury, what would be some ways it could survive on mercury? what things on mercury would allow for such life forms to form and how would it adapt?
homework help please...

2006-12-17 11:14:07 · 9 answers · asked by fawkingsupergirl 1 in Astronomy & Space

I learned that hydrofluoroalkanes have a short form of HFA but on wikipedia, on the page http://en.wikipedia.org/wiki/Aerosol_spray#Propellant there are reference to 2 HFA's. When I go to their page, their name is HFC something. Does anyone know whats with that ?

2006-12-17 11:13:38 · 1 answers · asked by dexter_sherban 2 in Chemistry

"The chart gives the average number of students per computer in public schools in America. Assuming a linear relationship, which is the best estimate for the number of students per computer during 1989-98?"

Year/Students per computer:

1990-91/20.0
1991-92/18.0
1992-93/16.0
1993-94/14.0
1994-95/10.5
1995-96/10.0
1996-97/7.8
1997-98/6.1

A) 5.4
B) 10.8
C) 20.2
D) 21.9"

I don't know how to get the answer. I've tried averaging the numbers, and also putting them into a TI-83+, going to STAT, insert the information, and find the LinReg (y=ax+b). What do I do? Please show how you got it so I understand it, thanks.

2006-12-17 11:10:44 · 6 answers · asked by Brad 2 in Mathematics

Math

2006-12-17 11:06:35 · 8 answers · asked by Anonymous in Mathematics

please please please someone help me answer these question. where are bamboo forests found in the world can you please provide a map? can u also help me find the nonliving factors in bamboo forests. please if u can also help me find the dominant plants and wild life ur help would truly be apprecaited.
Thanks a lot please answer my question!!

2006-12-17 11:05:24 · 1 answers · asked by Indian Volleyball Lover 2 in Other - Science

2006-12-17 11:02:59 · 9 answers · asked by Dave 1 in Mathematics

2006-12-17 10:59:22 · 5 answers · asked by Frank S 1 in Zoology

what is the derivative of (4x^8-sqrt(x))/(8x^4)??
it gets really complicated and i dont know how far to go in simplifying!

2006-12-17 10:57:21 · 3 answers · asked by Anonymous in Mathematics

On google moon, when you zoom all the way in, theres just a picture of cheese! Why'd they do that??

2006-12-17 10:56:23 · 4 answers · asked by gumchewer_7_7 2 in Astronomy & Space

2006-12-17 10:53:32 · 7 answers · asked by Anonymous in Mathematics

Please help!!!

2006-12-17 10:52:44 · 4 answers · asked by momoftwins1986 1 in Mathematics

2006-12-17 10:51:42 · 6 answers · asked by Ryan 2 in Other - Science

The law of conservation of matter says that matter can be destroyed nor crated..then how come energy is created when anergy is created when an atomic bomb explotes.E=mc2..I'm confused, can you explain this to me?

2006-12-17 10:50:25 · 7 answers · asked by Just 2 in Physics

How many liters of hydrogen are needed to react completely with 100 L of nitrogen gas at 1000K and 2500 atm?

I need a formula, and a brief explaination for this problem. Thanks!

2006-12-17 10:49:46 · 2 answers · asked by Anne 1 in Chemistry

Please show work on these 2 problems. Thank you.

2006-12-17 10:48:35 · 5 answers · asked by celticevening 1 in Mathematics

Global warming?
Who belives global warming is happening? I know there is hordes of evidence to support it, but, in MANY cases, of repressed information, there is proof of it NOT happening.

Does anyone know where there are places that have studies to support each side of the argument?

I remember reading about all those ice cliffs that slide off, that you see tapes of, is filmed from these two or three spots. Only. Nowhere else does ice come off like that. Also, that the poles are each getting colder, along with the sea levels hardly rising, and in some areas, not rising at all. South America, as I read, has not raised any. As Micheal Chricton said is "State of Fear" : "It's hard to say your country is flooding from sea water when sea levels are all the same." Or, something like that.

Yet, all the information supporting warming is important, the hottest times in US history, 8 out of 10 have happend in the last 10 years.

Any thoughts?

2006-12-17 10:47:45 · 18 answers · asked by Anonymous in Weather

2006-12-17 10:47:35 · 8 answers · asked by Anonymous in Earth Sciences & Geology

2006-12-17 10:47:30 · 3 answers · asked by kano7_1985 4 in Zoology

help me please, i know this is not hard but my head is not running = ="

complete the square to find the vertex and axis of symmetry

f(x) = 2x^2 + 12x +15

2006-12-17 10:47:01 · 6 answers · asked by Ganbatteru 3 in Mathematics

please help me solve this

(1+i)r^2-r+(1-i)=0

Y_Y i feel so dumb
thanks in advance!!

2006-12-17 10:43:56 · 2 answers · asked by Ganbatteru 3 in Mathematics

thanx alot

2006-12-17 10:42:56 · 3 answers · asked by sweetngel 1 in Chemistry