Science & Mathematics - 27 November 2007

Could you help me figuer out the value of x and y if..

3x + 5y = 11
2x + y = 3

And could you show me the workings out please so I can learn to do the method. Thanks.

x

2007-11-27 05:52:39 · 12 answers · asked by :) 3 in Mathematics

2007-11-27 05:48:03 · 2 answers · asked by Anonymous in Geography

Why is it that my honey starts to freeze up with crystals. Then I microwave it and it flows like water. But when it cools down, it is a virtual solid with far more crystals than before?

2007-11-27 05:46:34 · 3 answers · asked by Frst Grade Rocks! Ω 7 in Chemistry

I am trying to write science homework but do not know when to use which word! :S

2007-11-27 05:46:09 · 10 answers · asked by wendym63 2 in Biology

1- you don't have enough money to build practical model.
2- because the importance of that discover so many companies like to steal it from you so you can't trust to thies companies.
3- becuase you are still student in university, people can believe you unless see your details information of your discover (becuase the information security you can't share your details to every one who ask you)

2007-11-27 05:44:29 · 5 answers · asked by peeshro 2 in Astronomy & Space

2007-11-27 05:42:12 · 3 answers · asked by sf49erz21 2 in Chemistry

2007-11-27 05:41:43 · 20 answers · asked by foxfoxcar 1 in Astronomy & Space

seriously... its like every problem is different! :[ Now i need to use the second derivative test to find the relative maxma and minima...

y=-2x^2 + 8x + 25

okay. so i can find the first and second derivatives of these just fine.. but the second derivative turns into a constant so how do i go about using that to figure out the extremas?

2007-11-27 05:39:51 · 4 answers · asked by chelsie r 2 in Mathematics

2007-11-27 05:39:13 · 1 answers · asked by damanjd1 2 in Other - Science

This is a naturally occurring phenomena. Can you explain it?

For an example, see http://s226.photobucket.com/albums/dd11/jackphotos123/?action=view¤t=moon.jpg and ignore the photoshopped moon in the picture.

2007-11-27 05:38:32 · 3 answers · asked by Frst Grade Rocks! Ω 7 in Physics

http://i40.photobucket.com/albums/e215/xxs3xp1stolxx/Picture5.png

2007-11-27 05:36:59 · 3 answers · asked by KRISSAY F 1 in Mathematics

I'm just wondering what's the easiest way to find percent
(if it's easier for you, give an example)

2007-11-27 05:34:57 · 3 answers · asked by Rebecca S 2 in Mathematics

don't worry, not planning to kill anyone lols

just writing a short story and need some info

2007-11-27 05:28:03 · 8 answers · asked by looneyanaid 2 in Other - Alternative

2007-11-27 05:25:02 · 2 answers · asked by Stay Sharp 2 in Mathematics

2007-11-27 05:19:55 · 11 answers · asked by devourcat 1 in Geography

2007-11-27 05:19:27 · 12 answers · asked by foxfoxcar 1 in Astronomy & Space

and how it works

2007-11-27 05:13:15 · 2 answers · asked by ZAKES 1 in Physics

What does the number mean when you have worked out the standard deviation? I.e. I have a number of 14.30525 but what does that number represent etc?

Thanks

2007-11-27 05:11:36 · 5 answers · asked by Anonymous in Mathematics

The method needed to make oil is very simple and not even something that can be patented so is it just too easy to be something to make money doing that keeps it from being done? What is the problem with making oil from some of the trash we not dump in landfills and/or biomass?

2007-11-27 05:11:24 · 7 answers · asked by jim m 5 in Engineering

2007-11-27 05:09:28 · 7 answers · asked by Anonymous in Geography

How does the environment affect the population of a region?

2007-11-27 05:08:03 · 5 answers · asked by Anonymous in Geography

I believe 100% in the big bang and evolutionary theory. The big crunch is one of the main theories on what the ultimate fate of the Universe will be.Just as the big bang occurred, the Universe must collapse on itself sometime, so if this is true do you think it could be possible that the Universe has many cycles, expanding then collapsing into a tiny sphere of matter the size of a marble such as when the big bang occurred. Since we dont know the true answer to any of these questions, I believe we should be open to any idea, because all of them are right but none of them are wrong.. ;)

2007-11-27 05:07:44 · 7 answers · asked by rzaforshiza 1 in Astronomy & Space

a. A= 130 degrees, a=19, b=11
b. A=45 degrees, a= 4sqrt2, b=8
c. A=32 degrees, a=16, b=21
d. A=90 degrees, a=25, b=15

2007-11-27 05:06:40 · 1 answers · asked by ehrlich 6 in Mathematics

2007-11-27 05:06:08 · 23 answers · asked by Jade B-Dub 1 in Geography

Let C and C' be two abelian categories and let F:C---> C' a (additive?) functor. Suppose that "X non zero implies F(X) non zero". Does this imply that F is faithfull?

2007-11-27 05:06:06 · 4 answers · asked by Anonymous in Mathematics

You have a telescope that can detect all objects brighter than a minimum flux (or apparent brightness) level F. If you are observing quasars which have luminosity L which is 1500 times larger than the luminosity of a normal (non-active) galaxy, out to how much greater distance can you detect the quasars as compared to the galaxies?

2007-11-27 05:04:56 · 1 answers · asked by Anonymous in Astronomy & Space

a. How many moons can you find that are larger than our Moon in our solar system? Name them and their host planet. (4 points)
Answer:
b. For each of the moons you found in part (a) calculate the ratio of their diameter to the diameter of the planet they orbit. Comment on the value you find for the Moon-Earth system compared to the other values. (4 points)
Answer:
c. Which other terrestrial planet has moons? Name them.

2007-11-27 05:03:33 · 4 answers · asked by sojo3 1 in Astronomy & Space

why is the desert valuable and to who ?

how can a desert be protected from overuse?

2007-11-27 05:00:34 · 6 answers · asked by alewis.world 2 in Geography

2007-11-27 04:58:57 · 5 answers · asked by Anonymous in Astronomy & Space

2007-11-27 04:58:49 · 9 answers · asked by Bill W 【ツ】 6 in Earth Sciences & Geology