Science & Mathematics - 21 October 2007

determine wether the graph of each parabola opens upward or downward. Dose any one have a clue
y=-1/2 x^2+3

2007-10-21 05:06:55 · 4 answers · asked by sumguy 1 in Mathematics

A 30.0-g sample of water at 280. K is mixed with 50.0-g of water at 330. K. Caculate the final temperature of the mixture assuming no heat is lost to the surroundings.

2007-10-21 05:04:50 · 2 answers · asked by Anonymous in Chemistry

can a piece-wise function posess extrema on an interval?

2007-10-21 05:04:23 · 3 answers · asked by Anonymous in Mathematics

If the solution to an equation is imaginary or irrational, it takes a bit more effort to check. Replace x by each given number to verify each statement.

Both 2 + 3i and 2 - 3i satisfy x^2-4x+13=0

2007-10-21 05:00:36 · 2 answers · asked by Anonymous in Mathematics

2/7=n-5/n+8

please show work in ur answer.

:)

2007-10-21 05:00:22 · 5 answers · asked by hello 3 in Mathematics

2007-10-21 04:59:59 · 4 answers · asked by sweet heart 1 in Weather

2007-10-21 04:59:56 · 4 answers · asked by ♥ rock~n~roll♥ 2 in Other - Science

Which of the following statements concerning living phytoplanktonic organisms are true?
1. They are important members of communities surrounding deep-sea hydrothermal vents.
2. They are important primary producers in most aquatic food webs.
3. They are important in maintaining oxygen in Earth's seas and atmosphere.
4. They are most often found growing in the sediments of seas and oceans.
5. They can be so concentrated that they affect the color of seawater.

A. 2, 3, and 5
B. 1 and 4
C. 2, 3, and 4
D. 1, 2, and 4
E. 3, 4, and 5


I know choice 5 is true so now I'm stuck between A and E. Please help.

2007-10-21 04:55:24 · 2 answers · asked by Anonymous in Biology

2007-10-21 04:52:04 · 17 answers · asked by lil1 2 in Biology

Okay, so I asked this same question a couple days ago and no one has responded with anything that has helped me.
Anyone else have any ideas?

2007-10-21 04:49:12 · 3 answers · asked by MJ 1 in Mathematics

|t is said that hydrogen & helium is present over the space everywhere.
But it is also said that space is vacuum.
please give me a clear explanation

2007-10-21 04:42:49 · 12 answers · asked by Meera 2 in Astronomy & Space

2007-10-21 04:42:39 · 4 answers · asked by genius 2 in Biology

2007-10-21 04:38:28 · 5 answers · asked by Z 1 in Zoology

our universe houses all the galaxies stars and everything.... whati s its shape? is it changing constanatly? is it oval?round?
what is the shape of this large envelope?

2007-10-21 04:35:47 · 11 answers · asked by Anonymous in Astronomy & Space

2007-10-21 04:33:14 · 8 answers · asked by Richard C 3 in Medicine

2007-10-21 04:31:15 · 5 answers · asked by Tracy 1 in Astronomy & Space

Please explain...

2007-10-21 04:30:27 · 2 answers · asked by Anonymous in Biology

2007-10-21 04:30:08 · 5 answers · asked by Anonymous in Mathematics

2007-10-21 04:25:10 · 5 answers · asked by Anonymous in Physics

2007-10-21 04:22:42 · 5 answers · asked by D 2 in Mathematics

2007-10-21 04:18:45 · 7 answers · asked by ali d 3 in Astronomy & Space

I can't dp this for the life of me
please help
b^2+13b^2+36=0

2007-10-21 04:15:50 · 4 answers · asked by sumguy 1 in Mathematics

A few people who know me well tell me I should do research. I've thought yes, it suits my thorough personality best and but look how long it will take (another bachelors in science and then onto grad school in plant research or whatever)! I am in nursing. In my dream I was splicing and injecting a gene via bacteria vector into a plant.(I don't know if I got all the facts right). My dream was black and white. I am highly interested in cosmetic applications or pharma applications, though.

Is this dream indicating that I am taking this idea seriously (at least more seriously than before)--as a real possibility?

2007-10-21 04:14:36 · 1 answers · asked by Pansy 4 in Botany

2007-10-21 04:12:59 · 13 answers · asked by Anonymous in Weather

2007-10-21 04:12:17 · 7 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-21 04:12:05 · 7 answers · asked by Anonymous in Earth Sciences & Geology

x^2+x+√(x^2 +x)-2=0
I have no clue any help please

2007-10-21 04:12:01 · 1 answers · asked by mormar 1 in Mathematics

2007-10-21 04:11:19 · 11 answers · asked by nany_30200 1 in Physics

What do scientists think is the next evolutionary stage for humans. will we have three hands, telekenesis, better jumping abilities or even bigger sex organs lol

2007-10-21 04:03:43 · 20 answers · asked by Anonymous in Biology

2007-10-21 03:59:59 · 4 answers · asked by Anonymous in Medicine