Science & Mathematics - 4 October 2007

http://www.comcast.net/news/science/index.jsp?cat=SCIENCE&fn=/2007/10/04/780492.html

An article about crows using tools to find food. It's true that monkeys do this but it could be attributed to their intelligence an learned behavior. However, its hard to imagine a crow to have learned behavior to the point of making tools.

2007-10-04 19:02:38 · 6 answers · asked by Anonymous in Zoology

The image in the mirror is inverted left to right and right to left as an optical phinomina but not head is shown in the botton and feet are shown in the top.

2007-10-04 19:01:05 · 6 answers · asked by dswaroop1 1 in Physics

A train leaves the station traveling due east at a rate of 45 miles per hour.
A second train leavesa diffferent station an hour later traveling due west on the same track, going 60 miles per hour

If the stations are 255 miles apart, how many miles from the halfway point between the stations will the trains collide?

A) 0 B) 5 C) 7.5 D)12.5 E) 25

PLease help! I dont know where to start.... thank you!!!

2007-10-04 18:55:26 · 2 answers · asked by Anonymous in Mathematics

center= (-1,1)

2007-10-04 18:53:56 · 4 answers · asked by Anonymous in Mathematics

find (f*g)(x) and identify it's domain

f(x)= sqrt (x+8) ; g(x)=1-x^2

2007-10-04 18:51:19 · 3 answers · asked by rose 3 in Mathematics

why the expansion of the universe as seen from distance galaxy would look the same as seen from our galaxy?

2007-10-04 18:47:13 · 4 answers · asked by harisbahrudin 2 in Astronomy & Space

Through the evolutionary process how does information increase on the genome? Or in other words how can point mutations create new chromosomes or lengthen a strand of DNA? I.e. mice have 20 chromosones , humans have 23 and dogs have 39. How can genetic mutations create new chromosones?


I doubt that anyone can give me a satisfactory answer (but if you can provide a link) because this is one of the holes in the theory. And no this is not creationists propaganda, but a genuine question about the theory.

2007-10-04 18:45:09 · 7 answers · asked by Future 5 in Biology

how does the activity if detrivores might speed up the breakdown of dead organic matter by decomposers???

pls anyone know this? help.

thanks

2007-10-04 18:42:18 · 3 answers · asked by Anne-Ice♥cream 2 in Biology

how is their life what do they do

2007-10-04 18:39:21 · 8 answers · asked by Lucy A 1 in Weather

I love reading about peoples experience with the paranormal and pictures and research. Anyone know of any good websites....books etc

2007-10-04 18:35:20 · 9 answers · asked by Anonymous in Paranormal Phenomena

why not 200 or 400 volts????

2007-10-04 18:32:50 · 4 answers · asked by avinash 1 in Engineering

Ringbarking removes all of the tissue external to the vascular cambium but why does this cause the tree to die slowly?

2007-10-04 18:30:41 · 3 answers · asked by Roisin F 2 in Botany

I took several pictures in the backyard today... and around the sun there is a really big red circle - ray type thing... what is this called.

2007-10-04 18:25:52 · 2 answers · asked by angels 411xx 1 in Astronomy & Space

1.9h + 2< -79 (inequality)

2. 4y + 228 = 352 (equation)

3.12y = 132 (equation)

4.Given the formula K = LMN, what is the formula for M?

5.4m + 9 + 5m - 12 = 42. (equation)

2007-10-04 18:23:09 · 4 answers · asked by BravesFanForLife 3 in Mathematics

2007-10-04 18:21:31 · 2 answers · asked by lil bill 7 2 in Chemistry

To see which ones are poisonous, and stuff like that. Thank you in advance.

[[is this the right forum to post this question in??]]

2007-10-04 18:19:47 · 6 answers · asked by virtue.. 2 in Agriculture

Use this equation:
C(subscript 2)H(sub 6)O +3O(sub 2) ------- 2CO(sub 2) +3H(sub 2)O

If 135g of ethanol are combusted with 101g O(sub 2), what is the mass (grams) of carbon dioxide released into the atmosphere? It is multiple choice, but I just want to know how to do the problem.
Thanks for your help!

2007-10-04 18:17:12 · 2 answers · asked by lil bill 7 2 in Chemistry

I live in the US and have taken a name brand drug for a year and half that costs over $150 each month! I found the same drug on a Canadian pharmacy website called ADVCare.com for much less money.

I have been taking the Canadian pill for one week and feel like something's not quite right. I am having symptoms that I normally don't with a careful regimen and seem to have more side effects, like a pounding headache and sleeplessness.

Can anyone tell me their experience with American drugs vs. Canadian drugs? Any differences that you know of? Any professional pharmacists out there who may know? Your serious answers are greatly appreciated!

2007-10-04 18:12:54 · 3 answers · asked by Rechelvis 3 in Medicine

solve:

3x + 2y = -11
-3x - 2y = 10

i tried to solve one equation then plug it in the other but its just not happening??

please show work. im so confused???

2007-10-04 18:09:03 · 6 answers · asked by Anonymous in Mathematics

2007-10-04 18:02:56 · 5 answers · asked by Anonymous in Earth Sciences & Geology

I think it has something to do with pressure distribution.For the Same volume which of these will hold the water at less pressure cylinder or sphere.And which has larger surface area or volume between the cylinder or sphere

2007-10-04 17:48:25 · 5 answers · asked by Anonymous in Engineering

include a sorce or your question won't even count.

2007-10-04 17:47:41 · 2 answers · asked by Malloy. 1 in Zoology

i know this is like 7th grade knowledge but i forgot . tried looking online but they gave me 100 different things i didnt need to know.

if you can give me just one example so i can remember that would be great
thanks

2007-10-04 17:45:05 · 4 answers · asked by Spys On Pedestrians 4 in Mathematics

(a) {{∅}} ∈ {∅, {∅}}? TRUE
{{∅}} ⊆ {∅, {∅}}? TRUE

(b) {{∅}} ∈ {∅, {{∅}}}? TRUE
{{∅}} ⊆ {∅, {{∅}}}? TRUE

(c) {{∅}} ∈ {∅, {∅, {∅}}}? FALSE
{{∅}} ⊆ {∅, {∅, {∅}}}? FALSE


Just wanted to check my answers with anyone.
Thanks for any help or corrections.

2007-10-04 17:42:31 · 3 answers · asked by Anonymous in Mathematics

Let
A = {3, 4}
B = {3, 4} ∪ ∅
C = {3, 4} ∪ {∅}
D = {x (x − 3)(x − 4) = 0}
E = {∅, 3, 4}
F = {4, 4, 3}
G = {4, ∅, ∅, 3}
Which of these sets are equal?


** My Answer**:
Set B is equal to set C.
And set C is equal to set E.
And therefore set B is also equal to set E.

Any mistakes in that? Additions?

2007-10-04 17:39:53 · 1 answers · asked by Anonymous in Mathematics

If you startt at the top of the pyramid and slide all the way down the middle of one of the four sides,how many feet will you move.
*I applied the pythagorean theormem to the pramid. Then I applied it to the square.Do I add both answers to find out how many feet will I move?

2007-10-04 17:39:07 · 2 answers · asked by glamour girl 1 in Mathematics

2007-10-04 17:37:38 · 2 answers · asked by afiezx 1 in Physics

y=-x^3+8x^2-21x+18

Steps as to how you get them would be nice...

2007-10-04 17:28:28 · 3 answers · asked by Anonymous in Mathematics

2007-10-04 17:25:37 · 11 answers · asked by Anonymous in Weather

show works .

2007-10-04 17:23:16 · 14 answers · asked by ? 2 in Mathematics