Science & Mathematics - 30 January 2007

The problem is: Use a trig identity to determine the value of cos2x when.... tan x= (4x) / ((x^2) - 4) . Any help would be great. Thanks

2007-01-30 17:43:53 · 5 answers · asked by mathgeek5 1 in Mathematics

Solve for y:

x/8 + y/2 = 1

Once again, I'm lost. But it's my last question for the night!

2007-01-30 17:43:44 · 6 answers · asked by Arnold 3 in Mathematics

2007-01-30 17:40:54 · 10 answers · asked by Anonymous in Mathematics

Is there any simplified method of examining the DNA without giving trouble to the highly sphisticated labs? what sort of equipment u need for this purpose?

2007-01-30 17:38:06 · 2 answers · asked by phoenix 1 in Biology

2007-01-30 17:38:04 · 2 answers · asked by Johann 1 in Engineering

2007-01-30 17:35:54 · 5 answers · asked by Sergio 3 in Mathematics

The big bang theory states all matter was together at one point and an explosion sent it all hurling outward thus creating the universe. Thats great but what explains how the matter was there to begin with? Where did the matter that everything is made of come from??

2007-01-30 17:32:30 · 6 answers · asked by Anonymous in Astronomy & Space

2007-01-30 17:31:19 · 2 answers · asked by Thiagarajan S 1 in Engineering

I found an article ( http://www.rotten.com/library/sideshow/siamese-twins/chimeras/ ) that said that sometimes, when two twin embryos develop, they create siamese twins; and sometimes, the embryos wind up developing pretty much in the same place, so that the siamese twins take the space of a single person. They're called "chimeras" and might go their whole lives without knowing it, although some possible symptoms include having multiple bloodtypes and different-colored eyes.

How true is this? Where can I find more details?

If I see a person with one blue eye and one brown eye, is it likely that this person is actually two people?

2007-01-30 17:30:57 · 7 answers · asked by Anonymous in Biology

Give me a reason that i have ask a right Question.

2007-01-30 17:30:55 · 12 answers · asked by james l 2 in Astronomy & Space

Cause: ???

Effect: Sojourner could not communicate with the lander.


Please help! This is about Mars.

2007-01-30 17:29:28 · 3 answers · asked by Anonymous in Astronomy & Space

2007-01-30 17:27:53 · 4 answers · asked by shorty_gonecrazi 1 in Zoology

2007-01-30 17:27:17 · 4 answers · asked by concreteangel_66 1 in Geography

2007-01-30 17:26:37 · 1 answers · asked by Courtsie2004 m 1 in Chemistry

A tank in the form of a hemispherical bowl of radius 2m is full of water. Find the work required to pump all of the water to the point 3m above the tank.


I need to correct my midterm exam and i cant figure this out . Please show a few steps so i can understand .
Thanks

2007-01-30 17:25:15 · 4 answers · asked by moooona1987 2 in Mathematics

Cause: Pathfinder fired three small braking rockets.

Effect: ???

Please Help Me Understand the Effect.

2007-01-30 17:23:10 · 1 answers · asked by Anonymous in Astronomy & Space

Find the derivative of f(x) = x + (sq. root of x)??

I know we use f(x+h)-f(x) / h
but get lost doing the conjugates to solve, etc?????? help pls!

2007-01-30 17:22:56 · 7 answers · asked by Anonymous in Mathematics

2007-01-30 17:21:54 · 1 answers · asked by Courtsie2004 m 1 in Chemistry

2007-01-30 17:16:51 · 3 answers · asked by mitu 2 in Biology

can someone please help prove this math trick with inequalities

(a/b) < [(a+c)/(b+d)] < (c/d)

if you don't believe me that this trick works try it out for yourself.
like for instance:

(2/3) < x < (5/6)

just add the numerators and the denominators across
(2+5)/(3+6) = 7/9

and indeed
(2/3) < (7/9) < (5/6).

2007-01-30 17:14:39 · 10 answers · asked by black_lotus007@sbcglobal.net 3 in Mathematics

Thanks for the help.

2007-01-30 17:14:34 · 4 answers · asked by c_r_212 1 in Mathematics

1.find four consecutive integers such that 6 times the sum of the first and the fourth is 26 less than 10 times the 3rd.

and this one really got me

2.find 3 consecutive even integers such that the sum of the 1st and 2nd = the sum of the 3rd and -10

PS. this is my last 2 thank you to all that helped i really appreciate it. =]

2007-01-30 17:13:40 · 4 answers · asked by Anonymous in Mathematics

2007-01-30 17:12:10 · 1 answers · asked by RCAPPS 1 in Mathematics

y = x^2, y=4, x=0, x=2

2007-01-30 17:11:40 · 1 answers · asked by Elizabeth T 1 in Mathematics

Day after tommorow comes out and hollywood gets the twitch...
Ignorance leads them to believe they have this problem and the world's issues all figured out in a nice pie chart with some cashews on the side table....money and tax breaks can save the world....
too much money going either way...keep eating your media with gravy on it.

2007-01-30 17:10:09 · 9 answers · asked by AmplePressure 2 in Earth Sciences & Geology

Is it Mel's hole, in Washinton state, or is it somewhere else

2007-01-30 17:10:03 · 7 answers · asked by Big hands Big feet 7 in Geography

this is the formula for the sum of the interior angles of an n gon

(n-2)180

what does the 180 in the formula though show?

2007-01-30 17:08:51 · 5 answers · asked by Anonymous in Mathematics

2007-01-30 17:08:48 · 18 answers · asked by ernesto 1 in Physics

2007-01-30 17:07:46 · 6 answers · asked by Anonymous in Biology

If f(x)= 3x^2 - 4x - 5 / x^2 - 9 ......What is the domain of the Function.

2007-01-30 17:04:31 · 5 answers · asked by Anonymous in Mathematics