Science & Mathematics - 9 December 2007

x + y = 3
x +y= -1

A)one
B)none
C)infinite

x+2y=4
x+2y=-2

A)one
B)none
C)infinite

thank you in advance for your help. i am stuck.

2007-12-09 08:14:00 · 2 answers · asked by melannie21 2 in Mathematics

2007-12-09 08:13:38 · 5 answers · asked by duxyverse 1 in Astronomy & Space

2007-12-09 08:11:56 · 2 answers · asked by Julie M 1 in Earth Sciences & Geology

The human enzyme alcohol dehydrogenase, contains Zn 2+ ions. If one molecule of the enzyme weighs 1.328 * 10^(-19) g, and it is 0.327% Zn by mass, how many Zinc ions are present per molecule of enzyme?

a)1
b)2
c)3
d)4
e)5

2007-12-09 08:09:54 · 1 answers · asked by Guinness 3 in Chemistry

A. THORIUM-229
B. THORIUM-228
C. THORIUM-230
D. THORIUM-231

2007-12-09 08:08:48 · 5 answers · asked by Anonymous in Chemistry

2007-12-09 08:08:39 · 3 answers · asked by Anonymous in Physics

its no particular place just from the main area thanks to anyone who answers

2007-12-09 08:07:14 · 3 answers · asked by duuhhitzmaryy 3 in Geography

Tell me about the experiments to find it. Thanks.

2007-12-09 08:05:50 · 2 answers · asked by sabanguvenc 1 in Chemistry

2007-12-09 08:04:52 · 2 answers · asked by Parminder 1 in Earth Sciences & Geology

I found this problem really hard to solve, plz if u know how to do help me out by showing ur working for every single step:-

1) The line p has gradient 2/3 (two thirds) and passes through the point (6, -12). The line q has gradient -1 and passes through the point (5,5). The line p meets the x - axis at A and the line q meets the x-axis at B. Work out the gradient of the line joining the points A and B. (Remember there is only one gradient).

The right answer will get 10 points from me. Thnx a lot guys.

2007-12-09 08:04:33 · 4 answers · asked by varghese p 3 in Mathematics

Pure oxygen gas was first prepared by heating mercuric oxide, HgO:

what volume (in liters) of oxygen at STP is released by heating 10.57 g of HgO?

2 HgO(s) --> 2 Hg(l) + O2(g)

2007-12-09 08:02:29 · 3 answers · asked by Mike R 2 in Chemistry

Can anyone tell me any scientific links etc.

Need information about it that is scientific

thanks x

2007-12-09 07:55:33 · 2 answers · asked by x-Elle-x 2 in Other - Science

2007-12-09 07:55:16 · 10 answers · asked by ??? 3 in Chemistry

2007-12-09 07:54:56 · 10 answers · asked by Bill W 1 in Geography

The Problem: The TCO 99 standard from the FCC limits EMF (electromagnetic frequency) exposure to 2 mGauss, the term used to measure electromagnetic frequency, at a distance of 30 centimeters away from the front of a computer monitor. If I apply the regulation to 20 cell phones, how far do I have to be from a working cell phone to get an EMF reading of 2 mGauss, and will they comply with the TCO regulation?

It is hypothesized that a majority of the 20 cell phones that will be tested will conform to the regulation. To reiterate, at least 11 out of 20 of the cell phones will register 2 mGauss at a distance nearer than 30 centimeters.

So basically, I am using a guassmeter to measure and record if a cell phone's distance to 2mGauss is less or more than 30 centimeters. I just realized I don't have a control. :( :( :( :(

If you need more information, ask! I have it all on a word doc. Ready to copy and paste over.

2007-12-09 07:50:18 · 1 answers · asked by Anonymous in Other - Science

We are doing elements in this class.
And i need major help!!I was listening in class,I just dont get it.
But here is a problem i need help on.

Directions: Classify the following compounds as Ionic(Metals && NonMetals), Covalent (metals or nonmetals) or both (compounds containing the polyatomic Ion. )


Note: Parentaseth[sp] is for the Charge.
or the OPPOSITE of Powers.
1.) CaCl(2)
2.)Co(2)
3.)H(2)O
4.)BaSO(4)

Can someone atleast explain this to me??
Thanks.
Amanda

2007-12-09 07:49:24 · 1 answers · asked by Mandi 2 in Chemistry

Lots of people go onto the science section just to answer "god did it" every time Big Bang comes up.
Now I have an extremely good grasp of the evidence for the big bang and that evidence is of exceptional quality.
If you believe 100% in a creationist start to the universe, show me hard evidence that I can check please.
And don't use ID because in most cases it based on an incorrect interpretation of evolution.
Good luck.

2007-12-09 07:45:46 · 27 answers · asked by Mark G 7 in Astronomy & Space

And how is momentum involved?

2007-12-09 07:44:38 · 10 answers · asked by Anonymous in Physics

an electric current can be used to decompose, or break down, water into oxygen gas and hydrogen gas. this is an example of a

a. physical change
b. chemical change
c. change in state
d. pressure change

please tell me the answer and y that is the answer!!!

2007-12-09 07:44:11 · 5 answers · asked by ? 2 in Chemistry

2007-12-09 07:43:37 · 4 answers · asked by alex 1 in Chemistry

2007-12-09 07:41:55 · 13 answers · asked by Anonymous in Zoology

give sources plzzz..

2007-12-09 07:36:29 · 7 answers · asked by go_kartkid93 2 in Astronomy & Space

2007-12-09 07:34:52 · 0 answers · asked by Anonymous in Botany

If f(x) = x^2 - 2x, then how would I graph f([x])? this is the absolute of the x on the inside of f(x).

2007-12-09 07:34:32 · 1 answers · asked by xo_girl88 1 in Mathematics

where would u find them on the planet/????

2007-12-09 07:32:49 · 14 answers · asked by Anonymous in Geography

2007-12-09 07:31:36 · 9 answers · asked by 2kool4u 5 in Astronomy & Space

For science our teacher assigned us this project where we have to make a strong bridge, out of plain white spaghetti and WHITE glue...and I'm totally stuck on how to make it?
Can anyone help me?

2007-12-09 07:29:33 · 5 answers · asked by Anonymous in Other - Science

A particle moves along a line so that at any time t, its position is given by x(t) = 2pi + cos 2pi t

1. what is the velocity?
2. what is the acceleration?
3. What are the values of t is the particle at rest?
4. what is the maximum velocity?

2007-12-09 07:29:17 · 3 answers · asked by xo_girl88 1 in Mathematics

2007-12-09 07:26:25 · 4 answers · asked by KC 1 in Chemistry

2007-12-09 07:26:20 · 1 answers · asked by Anonymous in Astronomy & Space