Science & Mathematics - 21 July 2007

A. the x-variable explains 50% of the variability in the y-variable
B. the x-variable explains -50% of he variability in the y-variable
C. the x-variable explains 25% of the variability in the y-variable
D. the x variable explains -25% of the variability in the y-variable

2007-07-21 11:31:06 · 2 answers · asked by Veronica C 1 in Mathematics

I have noticed than in people of color, their upper lip is dark most of the time. Why is this? I would think it would have something to do with melanoma, but I don't know.

I'd really appreciate an answer. Thank you very much.

2007-07-21 11:25:17 · 7 answers · asked by hey 2 in Biology

by the time you come out from a visit the air temperature feels freezing,surely this sudden change in temprature cant be good for visitors?

2007-07-21 11:24:34 · 12 answers · asked by Brian M 1 in Earth Sciences & Geology

When I say ideas I mean theories because what they think is as interesting as what their actually seeing. New discoveries create new ideas.

2007-07-21 11:22:32 · 6 answers · asked by Sean 7 in Astronomy & Space

dog lots of fur?its small

2007-07-21 11:22:05 · 2 answers · asked by crystal g 1 in Earth Sciences & Geology

I create a polygon at the Google Earth 3D viewer. I want to learn a method by which I can calculate its area.

2007-07-21 11:20:14 · 7 answers · asked by hisham_saqaf 1 in Mathematics

I'm supposed to explain how the trick works, but I don't even know how to figure out the missing digits. Can I get some help in figuring out the digits?

Select any three-digit number whose first and third digits are different. Reverse the digits and find the difference between the two numbers. By knowing only the hundreds digits in the difference, explain how it is possible to determine the other two digits. Explain how the trick works.

2007-07-21 11:19:33 · 2 answers · asked by Anonymous in Mathematics

2007-07-21 11:18:43 · 7 answers · asked by Anonymous in Earth Sciences & Geology

If the expression:

-2t-5 / 9t-6

is to make sense, the values that t can take must be restricted. State the restriction on t

2007-07-21 11:15:33 · 5 answers · asked by Anonymous in Mathematics

2007-07-21 11:14:36 · 6 answers · asked by Anonymous in Weather

When the sunshine comes up again am i at risk of melting?
Im so scared

2007-07-21 11:14:13 · 7 answers · asked by Anonymous in Weather

2007-07-21 11:10:47 · 17 answers · asked by Anonymous in Physics

2007-07-21 11:06:56 · 9 answers · asked by jrels2 2 in Other - Science

If i get wet then will i multiply?

2007-07-21 11:02:55 · 9 answers · asked by Anonymous in Biology

What kinds of organisms perform photosynthesis? (beside plants) and which perform respiration?

2007-07-21 11:00:48 · 2 answers · asked by Ivy 1 in Biology

if a lion and tiger can breed, then how can you say that people of different ethnicities are not different species because we can interbreed?

2007-07-21 10:58:47 · 7 answers · asked by peepeepoopoo 1 in Biology

2007-07-21 10:57:01 · 3 answers · asked by Quynh N 2 in Chemistry

im looking to buy flash powder. but its near impossible to get.

2007-07-21 10:56:07 · 4 answers · asked by snowsurfer8021 1 in Chemistry

Is it still raining in your neck of the woods? Tis here in Peterborough!

2007-07-21 10:55:56 · 1 answers · asked by lollipoppett2005 6 in Weather

is there a simple program or a way i can get my computer to recognize number paterns in order to closesly predict following numbers in those patern sequences?

2007-07-21 10:55:14 · 3 answers · asked by ? 1 in Mathematics

2007-07-21 10:54:47 · 17 answers · asked by Chris B 1 in Weather

A. correlation table
B. contingency table
C. corroborative table
D. contiguous table

2007-07-21 10:50:15 · 1 answers · asked by princessarianna33 1 in Mathematics

would his (or her) weight change?

Alternate way of asking: If we could isolate the one liter inhaled and the one liter exhaled what would be the diferrence in their weight?

I came across some info the other day that said (if I remember right) that CO2 is denser than Oxygen. So I am thinking that the exhaled liter would weigh a little more than the inhaled liter and hence the body would have lost a miniscule amount.

I am sure this might be more complex with the Krebs cycle and all that but it would seem to me that what I am asking could be tested or perhaps even have an answer right now.......I hope

2007-07-21 10:50:14 · 7 answers · asked by andyg77 7 in Biology

2007-07-21 10:43:15 · 4 answers · asked by Anonymous in Astronomy & Space

Have they identified the gene or genes that makes people predisposed to demonic possession yet?

2007-07-21 10:37:55 · 5 answers · asked by Aaron W 3 in Biology

I know what the pattern is doing, but how do I articulate it in mathematical terms? Also, I don't understand part b. How can this pattern not work? Doesn't it just continue?

a.) What is the pattern?
b.) How many addends are there the first time the pattern no longer works?

1 + 11 =
1 + 11 + 111 =
1 + 11 + 111 + 1111 =

(The sums are 12, 123, and 1234 respectively, if that helps.)

2007-07-21 10:34:32 · 3 answers · asked by Anonymous in Mathematics

When NASA first started sending up astronauts, they quickly discovered that ballpoint pens would not work in zero gravity. To combat the problem,
NASA scientists spent a decade and $12 billion to develop a pen that writes in zero gravity, upside down, underwater, on almost any surface including glass and at temperatures ranging from below freezing to 300°C.

The Russians used a pencil.

2007-07-21 10:33:13 · 15 answers · asked by Карина 3 in Astronomy & Space

did I do these correctly?
Decomposition reactions:
(NH4)2CO3-->CON2H4+2H2O
2KIO3-->3O2+ 2KI
KIO3+ AgNO3--->O2 + AgI ????
KI + AgNO3---> ???
KClO3---> ???

2007-07-21 10:31:45 · 2 answers · asked by pwbapro 1 in Chemistry

2007-07-21 10:31:09 · 8 answers · asked by toniatwty 1 in Mathematics

2007-07-21 10:27:38 · 15 answers · asked by FutbolFan2147 5 in Astronomy & Space