Science & Mathematics - 20 August 2007

2(3x-2)+4(x+1)=5x+30
solve for x

i get
2(3x-2)+4(x+1)=5x+30
6x - 4 + 4x + 4 = 5x+ 30
There is a -4 and a +4 on the same side of the equation now, with no brackets, they therefore cancel (-4 + 4 = 0)
6x + 4x = 5x+ 30
10x = 5x +30
10x-5x = 30
5x=30
X=6

thanks ever so much

2007-08-20 10:10:44 · 30 answers · asked by peppypop 2 in Mathematics

We know that if we travel faster, we go slowly in time and there is no motivation to come back. So, this is a motivation for building very large spaceships where an entire community can travel. Your community travel with you, so the "coming back" does not even make sense. Maybe what I am going to suggest here is not a new hypothesis, but it just came to me. What if some of the large asteroids orbiting some planets in our solar system was in fact a disguised spaceship hiding an entire community of aliens? Ok Ok, I know, it's time that I quit Y!A.

2007-08-20 10:05:05 · 5 answers · asked by My account has been compromised 2 in Astronomy & Space

does the temprature of an ideal gas increase, decrease or remain the sameduring

a) an iso thermal expansion
b) expansion at constant pressure
c) an adiabatic expansion
d) increase in pressure at constant volume

2007-08-20 10:04:32 · 1 answers · asked by Anonymous in Chemistry

do you beleive in the STARGATE program.

do you think that the STARGATE is real.

2007-08-20 10:04:27 · 12 answers · asked by hellogoodbye 1 in Astronomy & Space

I want to get good marks this year, and one of my courses includes Calculus. Is it as hard as I've heard throughout my academic career? I mean, Calculus is synonomous with really hard or impossible work.

I'm not a math genius or a ridiculously smart person, but I'm fairly good at math, and can catch on to concepts well enough. How will I do in Calculus?

Also, is it fun? I've heard it's fun if you like math, and I like math.

2007-08-20 10:00:47 · 10 answers · asked by Anonymous in Mathematics

Branch of science : Life, Earth, Physical
List what goes with what.

Zoologist
Astronomer
Ethnobotanist
Paleontologist
Meteorologist
Ichthyologist
Ornithologist
Entomologist
Chemist
Anthropologist
Herpetologist

2007-08-20 09:55:31 · 1 answers · asked by Anonymous in Astronomy & Space

3x^2-18x+25 ?

please help me! i would really appreciate it!

2007-08-20 09:55:21 · 4 answers · asked by Anonymous in Mathematics

I work in a lab which deals with Radon Gas. Radon gas decomposes into radioactive solids which readily adhear to dust particles and the like. This lab was not being used for at least 2-3 years before I got involved. We have a radon monitor which gives an estimate of current radon levels. When I first started the radon levels were around 18 or 19 pCi/Liter. Which is about 5 times the acceptable level. Well I adjusted the exhaust tubing so that it expells the gas outside now, so it harms noone. However, during these 2-3 years before I was involved everyone on this floor was likely exposed to this gas and its daughter particles. Should I say something even though I have no proof to back up my claims? It may very well be that much of the dust in this lab is laden with radioactive particles. What do you guys/gals think about this?

2007-08-20 09:53:41 · 6 answers · asked by Anonymous in Engineering

Is it not true that einstein saw a ufo once and that he vanisished for 8 days and that no one can account for this.
Is it not possible that aliens told him that famous equation E=MC2.

2007-08-20 09:49:31 · 12 answers · asked by emc.squared 1 in Physics

2007-08-20 09:43:36 · 4 answers · asked by yeahxitsxsarah 2 in Mathematics

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What does the line over a number mean? example: 2.23 and pretend there is a line over the last two numbers.

2007-08-20 09:41:02 · 9 answers · asked by Jeff 1 in Mathematics

(x=3)/8=x/2

(-2/3)x>12

5x<-7x-36

2007-08-20 09:39:33 · 5 answers · asked by Lori 1 in Mathematics

Convert each of the following rational numbers to the form a/b, where a and b are integers and b ≠0.
a) 0.27
b) 3.104
c) 0.24

2007-08-20 09:39:32 · 5 answers · asked by Jeff 1 in Mathematics

2007-08-20 09:37:39 · 6 answers · asked by quigonpie@btinternet.com 1 in Biology

x - y = 3
2x - y = -1

is this right
2x - y = 2

then what? lol

----------------------------

2x + 4y = 10
3x - 2y = -9

2007-08-20 09:36:33 · 4 answers · asked by Ruth 2 in Mathematics

Use the tagging and recapturing technique to estimate the number of fish in a pond. Suppose 140 fish were captured, tagged, and released. Then 50 fish were recaptured and among them 20 were found to be tagged. Estimate the number of fish in the lake.

2007-08-20 09:33:18 · 6 answers · asked by Anonymous in Mathematics

Through an infrared thermal imaging camera?

2007-08-20 09:32:05 · 3 answers · asked by Anonymous in Physics

I know the summation notation operator is Σ; but how do you use it to find the sum of a series?

2007-08-20 09:26:44 · 3 answers · asked by Tim B 3 in Mathematics

my guess is 2 and 4, but i could be wrong.

2007-08-20 09:26:07 · 1 answers · asked by Cat 3 in Mathematics

visit us on earth, when they arrive would their technology be more advance or less advance?

The key assumption here is that everything, their galaxy formation, their sun formation, ... technology, etc. evolved in the same way for them as for us.

You need to consider the effect of relativity. Everything is exactly the same at each location, but, once they get into the ship and accelerate, they have a different time.

Also, since it happens in the future, the fact that we do not have the technology now is irrelevant.

Also, if every thing is *exactly* the same, two spaceships will meet in the middle, but still you must consider the situation when they arrive on earth.

2007-08-20 09:24:22 · 6 answers · asked by My account has been compromised 2 in Astronomy & Space

I cant think of one single thing that is affected by time ... can you? ........ for instance ..... does the passage of time age us? .... no .... our cells break down thats all ....... I believe time is merely a recording of events by humans ... but does not actually exist .... there is no "time" as such.

2007-08-20 09:24:06 · 14 answers · asked by rich r 1 in Physics

It's really irritating. What are we going to do when they become law? Will mood lighting become a thing of the past, unless you get on a ladder and change the bulb for a lower wattage?

Also they tell you that they're equivalent to 60w or whatever, but they don't give the same light you would expect at that rating.

I'm not impressed, and I can't say I've seen any discernable drop in my electricitty bill, either.

2007-08-20 09:20:16 · 8 answers · asked by Guru Nana 2 in Physics

2007-08-20 09:15:50 · 6 answers · asked by Anonymous in Earth Sciences & Geology

2007-08-20 09:13:54 · 7 answers · asked by hernanleiva 1 in Mathematics

solve and check equation. Use the domain rational number?
please help me out..

2007-08-20 09:11:39 · 3 answers · asked by Anonymous in Mathematics

so... it's commonly accepted that NOTHING is faster than the speed of light (aside from theoretical stuff such as tachyons and spaceships). well what about the force of gravity?

if the sun all of a sudden just disappears, would earth be orbiting nothing until the force of gravity ends and it'd just fly tangent?

oh and also... just wondering. if luke skywalker fires a laser from his blaster on his MOVING speeder, would the laser (obviously flying at the speed of light) go any faster?? because from the added speed of the speeder?

2007-08-20 09:11:33 · 12 answers · asked by Bao Pham 3 in Astronomy & Space

thank you!

2007-08-20 09:08:16 · 4 answers · asked by yeahxitsxsarah 2 in Mathematics

Vapor pressure results from molecules in motion as they leave the liquid surface and become vapor. When molecules leave the liquid surface, how is pressure created?

In other words, how is vapor pressure formed? Where does the force come from?

2007-08-20 09:03:05 · 4 answers · asked by petswodahs 1 in Chemistry

Explain it as detailed as possible.

2007-08-20 09:00:07 · 3 answers · asked by petswodahs 1 in Chemistry