Science & Mathematics - 1 August 2007

factor each polynomial, state if the polynomial is prime

2007-08-01 18:11:39 · 6 answers · asked by Anonymous in Mathematics

Use grouping to factor the polynomial completely

2007-08-01 18:00:59 · 11 answers · asked by Anonymous in Mathematics

I know that before the industrial revolution began the Earth's atmosphere held close to 23% oxygen, and that humans start to get dizzy in rooms holding only 15 to 17 % oxygen, but what is the mandatory % of oxygen for humans to breath and remain concious? Also, what are the current oxygen ratios to the Earth's atmosphere at the present date of August 1st, 2007?

2007-08-01 17:59:37 · 2 answers · asked by theo_exploration 1 in Chemistry

Genetics and Throwbacks?
I was reading the other day about a South African girl born to white parents. The parents had had black ancestors, and although the parents *looked* white, they still had the black genes in them, and they produced a black child. (This is true-http://www.geocities.com/kempcountrymen/sandralaing.htm My question is, could the same happen with Asian parents producing a black child, or black parents having a white child? I'm guessing it's different. I'm curious to know.

(Just want to say, I am in no way being racist.)

2007-08-01 17:57:16 · 6 answers · asked by Anonymous in Biology

2007-08-01 17:57:07 · 4 answers · asked by maya 1 in Mathematics

factor the polynomial

2007-08-01 17:54:59 · 8 answers · asked by Anonymous in Mathematics

2007-08-01 17:51:32 · 4 answers · asked by almira 1 in Mathematics

2007-08-01 17:49:46 · 12 answers · asked by hot_leo 1 in Mathematics

a. always less than its original mass number.
b. always more than its original mass number.
c. always the same as its original mass number.
d. never less than its original mass number.
e. never more than its original mass number.

2007-08-01 17:48:32 · 4 answers · asked by Moe K 1 in Chemistry

A cylindrical tank is on the ground (lying on its side), is only half full of water, and has a radius of 1ft and length 5ft. The cylindrical tank has a pipe coming out of the side of the tank (so it is pointing upwards because the tank is on the ground on its side). The spout that points straight upwards is 1.5ft high (so total distance from ground to top of spout is 2r + 1.5ft = 3.5ft). Set up the integral to find out how much work needs to be done to pump the water out of the outlet to the top... water density is 62.5lb/ft^3 ). Do not evaluate integral.

so far I have:

(∫) from 0→1 [(10[1-√(1-x²)])(3.5-x)(62.5)]dx

and the variable x is the the distance from the ground at point 0→x, which points upwards...

2007-08-01 17:46:05 · 1 answers · asked by Anonymous in Mathematics

2007-08-01 17:45:56 · 12 answers · asked by chess_e4_pr 1 in Engineering

Factor out the GCF in the expression

2007-08-01 17:43:59 · 5 answers · asked by Anonymous in Mathematics

Can Gasoline Boil?
I want links to websites with real creditable facts.

2007-08-01 17:38:52 · 7 answers · asked by cutlassguyeightyeight 2 in Chemistry

If a natural disaster occured, would people be able to get their prescriptions?

I take several medications and even though I wouldn't die if I didn't have my medications I would be in a lot of pain. I always wondered if they brought you medication, or if you could go get it in another area not effected by the disaster, or would you just be SOL? Would they provide only to the ones that need the medication to live or would they provide to everyone? Or no one? Does anyone know what happens to people who have prescriptions in this situation?

2007-08-01 17:36:58 · 5 answers · asked by DiNoto 1 in Medicine

Write the equation that shows how radium 226 decays to give off an alpha particle and another element.

2007-08-01 17:34:26 · 2 answers · asked by MizzKin 1 in Physics

On a 570 mile trip, Andy averaged 5 miles per hour faster for the last 240
miles than he did for the first 330 miles. The entire trip took 10 hours. How
fast did Andy travel for the first 330 miles?

2007-08-01 17:33:03 · 2 answers · asked by Tazzzy 1 in Mathematics

what will be the volume of the gas sample if the pressure increases to 900 mm and the temperature increases to 35 degrees celisus?

2007-08-01 17:32:39 · 4 answers · asked by Anonymous in Chemistry

Two airplanes leave New York at the same time and fly in opposite directions,
if one travels at 500 miles per hour and the other at 550 miles per
hour, how long will it take for them to be 4200 miles apart?

2007-08-01 17:32:13 · 7 answers · asked by Tazzzy 1 in Mathematics

Eva invested a certain amount of money at 10% interest and $1000 more
than that amount at 11%. Her total yearly interest was $740. How much
did she invest at each rate?

2007-08-01 17:31:44 · 4 answers · asked by Tazzzy 1 in Mathematics

Suppose that you have a supply of a 15% solution of alcohol and a 45%
solution of alcohol. How many quart of each should be mixed to produce 30
quarts that is 25% alcohol?

2007-08-01 17:25:01 · 2 answers · asked by Tazzzy 1 in Mathematics

Barry can do a certain job in 4 hours, whereas it takes Mike 6 hours to do
the same job. How long would it take them to do the job working together?

2007-08-01 17:24:31 · 7 answers · asked by Tazzzy 1 in Mathematics

do you believe in life on other planets??? why or why not???

2007-08-01 17:21:14 · 14 answers · asked by julie h 2 in Astronomy & Space

i personally think a tornado is because of what they can do for such a small storm , what do you think !

2007-08-01 17:11:41 · 12 answers · asked by SteelersJourney 3 in Weather

How do you find the solution to this initial value problem? y'' + 2y' + 5y = 4e^(-t)*cos(2t) where y(0) = 1, and y'(0) = 0. Thanks a lot. The answer by the way is y = e^(-t)*cos(2t) + (1/2)*e^(-t)*sin(2t) + t*e^(-t)*sin(2t).

2007-08-01 17:09:53 · 2 answers · asked by Charlie4590 2 in Mathematics

My thought is that a large portion of road collapsed due to the resurfacing and damaged the bridge's support.

It's obvious the talking heads on TV have nothing of substance to add at this point, so I'm turning to the yahoo for some great expert and thinks-they're-an-expert opinions.

2007-08-01 17:05:40 · 12 answers · asked by MDHarp 4 in Engineering

How to you find the general solution to this equation? y'' + y = 3sin(2t) + tcos(2t). Thanks a lot. The answer by the way is y = (c1)cos(t) + (c2)sin(t) - 1/3*t*cos(2t) - (5/9)sin(2t).

2007-08-01 17:04:44 · 1 answers · asked by Charlie4590 2 in Mathematics

My buddy just called me and advised me that this morning he had vivid visions of an impending attack on U.S. & Russian infrastructure simultaneously by terrorists. The areas affected would be oil, water,and food supplies. Neither of us subscribe to much to psychic abilities and other super natural phenomenon, but he said that this was not the first time. He had a similar feeling but to a lesser degree back in 1999 and we all know what happened shortly there after. What do I do? He said he confided in me because he is at a loss and was hoping I would have some idea of what to do. Typically, I have a nack for coming up with solutions to complex problems or issues. I gotta be honest, this one has me a bit stumped and a bit scared.

2007-08-01 17:03:29 · 14 answers · asked by Hmmmm 1 in Parapsychology

How do you find the general solution of this equation? y'' + 2y' + y = 2e^t. The answer is y = (c1)e^(-t) + (c2)te^(-t) + t^2*e^(-t). Thanks.

2007-08-01 17:02:17 · 2 answers · asked by Charlie4590 2 in Mathematics

what majors in college - physics I assume and then what next?!?!?!

2007-08-01 16:54:20 · 5 answers · asked by Anonymous in Physics

Why is it that pulse pressure (diff between systolic and diastolic P) is chronically increased by arteriosclerosis? It has to do with elastic arteries being less stretchy but how?
also, at the end of the arterial tree, there is no elastic rebound of vessels and so pulse pressure has disappeared? what does that mean?
Thanks.

2007-08-01 16:52:20 · 1 answers · asked by freezerfairy 1 in Medicine