Science & Mathematics - 2 February 2007

2007-02-02 09:47:24 · 24 answers · asked by Anonymous in Physics

4x-6y=5
2x-3y=7

And

3x+2=16
2x-3y=-11

2007-02-02 09:46:02 · 7 answers · asked by Anonymous in Mathematics

I woke up the other night and opened my bedroom window. It was late and there wasn't a sound, there was that smell of warmth in the air and it was as still as it was quiet. The moon was so bright you would have thought it full, but it was a large crescent and sat on the horizon, making it a rich deep yellow. There weren't any clouds, and the sky was that sort of blue/grey colour, sprinkled with thousands of stars. It was really romantic. Have you ever seen a night or morning like it?

2007-02-02 09:45:11 · 8 answers · asked by samootch 2 in Astronomy & Space

Let G be a group with the following propert: Whenever a,b and c belong to G and aba = ca, then b = c. Prove that G is Abelian.

2007-02-02 09:44:44 · 2 answers · asked by VT 1 in Mathematics

2007-02-02 09:44:08 · 2 answers · asked by suzy h 1 in Chemistry

2007-02-02 09:42:39 · 14 answers · asked by Georgeu 3 in Biology

2007-02-02 09:41:26 · 12 answers · asked by Georgeu 3 in Biology

2007-02-02 09:40:40 · 2 answers · asked by Stumped 3 in Earth Sciences & Geology

2007-02-02 09:40:13 · 2 answers · asked by Anonymous in Earth Sciences & Geology

I think thiers like no point to it i mean, how does it help the world at all, and hows it so important

2007-02-02 09:39:45 · 6 answers · asked by ME 2 in Astronomy & Space

And what is it in the developing world?

2007-02-02 09:38:22 · 2 answers · asked by Anonymous in Biology

Hi, I need to know why stainless steel is rust proof please tell me its for my science project. :)

2007-02-02 09:38:18 · 15 answers · asked by mlmj1994 2 in Chemistry

2007-02-02 09:37:23 · 9 answers · asked by LENA G 1 in Mathematics

1. Define the sequence {Sn } inductively by: S1 = square root of( 3) and Sn+1 = square root of (3 Sn).
(a) Prove Sn is bounded above by 3.
(b) Prove Sn is increasing
(c)Deduce that Sn converges


2. Let S be a set of real numbers such that S is not equal empty set and S is bounded below. Thus
(There exists u in R) ( x in S => u Let T = { x: -x in S}
(a)Prove that T is not equal to empty set and that T is bounded above by –u
(b) Let b = l.u.b.T, Prove –b = g.l.b.S

2007-02-02 09:37:02 · 3 answers · asked by Ann T 1 in Mathematics

In a lisitng of chemicals, indentical names are sometimes followed by "indicator gr". What does that mean and as importantly what does that imply about the actual compound (quality, purity, etc...)? Thanks.

2007-02-02 09:35:46 · 2 answers · asked by Mike D 1 in Chemistry

Find the five numbers if:
1/a + 1/b + 1/c + 1/d + 1/e = 1
in which a,b,c,d,e can not be equal to each other

2007-02-02 09:35:22 · 4 answers · asked by bubble345221 2 in Mathematics

2.Most populations on earth are affected by several factors, such as genetic drift, mutations, and natural selection. Which of the following statements can be made about a population that experiences changes in gene frequencies?

A.The Hardy-Weinberg equilibrium is maintained.

B.Evolution is occurring in the population.

C.Lethal genes will eventually be expressed.

D.Mutations will not affect the population.

2007-02-02 09:35:17 · 3 answers · asked by Penguin Lover 1 in Biology

i live in chicago has it ever reached here i dont mean like the stormes or rain that falls when ever there is a hurricane i mean like some of the strong winds and stuff

2007-02-02 09:34:32 · 7 answers · asked by titanic 1 in Weather

...Just curious.

Maybe somewhere warm and tropical, but not blazing hot. Or breezy, but not too dry. Thanks.

2007-02-02 09:33:57 · 9 answers · asked by The Reaganite 3 in Earth Sciences & Geology

1.Which of the following individuals is most likely to allow a recessive lethal gene to be kept in a population over several generations?
A.homozygous dominant

B.homozygous recessive

C.heterozygous

3.A population of crocodiles is said to be in Hardy-Weinberg equilibrium. If so, which of the following must be true?
A. Genetic drift is taking place.

B. New individuals are migrating into the population.

C. Natural selection is placing pressure on allele frequencies.

D. No new mutations have occurred.

2007-02-02 09:33:27 · 4 answers · asked by Penguin Lover 1 in Biology

I would like to know the formula for the nth term explained to me in the simplest possible way and how i would go about finding the formula.

2007-02-02 09:24:08 · 2 answers · asked by fairygirlpie9 2 in Mathematics

I have a generator that is 120 volts ac or 12 volts dc. It is powered by a 5 horse power engine. It says 5 k 262 on the specks. what is the power out put in watts. What can I run off this generator?

2007-02-02 09:23:24 · 2 answers · asked by Anonymous in Engineering

are they a fruit?? vegetable??

2007-02-02 09:20:49 · 18 answers · asked by DANIEL F 1 in Botany

Am having a problem with this and I'm not sure what I'm doing incorrectly. Please see below the problem statement for what I've tried so far. Any guidance would be appreciated!

A 62.0 ohm resistor is connected in parallel with a 121.0 ohm resistor. This parallel group is connected in series with a 17.0 ohm resistor. The total combination is connected across a 15.0 V battery.

(a) Find the current in the 121.0 resistor.
(b) Find the power dissipated in the 121.0 resistor.

When I combined the parallel resistors I came up with 41.5 ohms which I then added to the 17 ohms that this resistors was in series with to get 58.5 ohms. However, when I used the equation I=V/R (I= 15.0V/58.5 ohms) the answer I got was not correct for the current. I'm not sure what I'm doing wrong here.

2007-02-02 09:19:31 · 6 answers · asked by larkinfan11 3 in Physics

The problem is...
simplify:
-9 + (-5) j + 3 + (-2) j

I got -13j , I don't need to know the answer I just need to know if I got the wrong answer

2007-02-02 09:19:01 · 10 answers · asked by Anonymous in Mathematics

plz

2007-02-02 09:18:23 · 6 answers · asked by ? 1 in Mathematics

2007-02-02 09:18:07 · 18 answers · asked by Anonymous in Biology

and if you don't mind, could you please state the source you got the info from if you got it from a website. please and thank you

2007-02-02 09:16:18 · 4 answers · asked by iNeedhelp 4 in Other - Science

I know it was stupid, but I took 1 1/2 pills of ritalin and 2 advils and I think I'm dying. My throat is blcoking and I'm shaking but I dunno what to do/ I have to many thopughts going on here and my heart is racing and I'm on here I dunnp why though. I think I'm going crazy and I dunto whud to do. What's going on. Is it that I took these pills with pain releivers?

2007-02-02 09:16:10 · 11 answers · asked by Anonymous in Medicine

2007-02-02 09:14:06 · 13 answers · asked by catrin l 7 in Biology