Science & Mathematics - 28 January 2007

Find the half- life of a radio-active substance that is reduced by 20% in 30 hours. (Give your answer correct to three decimal places.)

2007-01-28 15:38:33 · 4 answers · asked by yassine 1 in Mathematics

An object was measured with a metre stick. At one end the reading was (1.00+- 0.05) cm. and at the other ( 13.73 +- 0.02) cm. How long is this object?

2007-01-28 15:36:14 · 1 answers · asked by element69ca 1 in Physics

If so, where?

2007-01-28 15:35:27 · 1 answers · asked by Ejsenstejn 2 in Earth Sciences & Geology

2007-01-28 15:35:15 · 2 answers · asked by -jAiVe- 1 in Chemistry

2007-01-28 15:34:53 · 9 answers · asked by Ejsenstejn 2 in Engineering

2007-01-28 15:34:30 · 1 answers · asked by -jAiVe- 1 in Chemistry

Where do you hold an axe to generate the most force? Near the axe part, the middle or, at the end?

2007-01-28 15:34:20 · 12 answers · asked by Anonymous in Physics

Use the remainder theorem and the factor theorem to determine whether (y-3) is a factor of (y^4 + 2y^2 -4).


A. The remainder is 0 and, therefore, (y-3) is a factor of (y^4 + 2y^2 -4).


B. The remainder is 0 and, therefore, (y-3) isn't a factor of (y^4 + 2y^2 -4).


C. The remainder isn't 0 and, therefore, (y-3) is a factor of (y^4 + 2y^2 -4).


D. The remainder isn't 0 and, therefore, (y-3) isn'tfactor of (y^4 + 2y^2 -4).


Please explain .......THANKS

2007-01-28 15:33:25 · 5 answers · asked by victorbusta5 2 in Mathematics

a. immature stage that is able to reproduce
b. early colony of cells of fresh-water sponges
c. early stage of development of an organism, typically part of plankton
d. sperm cell that lives free in the water
e. egg that has been fertilized by more than one sperm

2007-01-28 15:30:21 · 1 answers · asked by Anonymous in Biology

2007-01-28 15:30:08 · 3 answers · asked by princess 1 in Mathematics

At veronica's school, the record for running the cross-country course is 24 minutes 22 seconds. At a race, veronica runs part of the course in 16 minutes 37 seconds.

To equal the record, in how many seconds must veronica run the rest of the course??

Ok, I thought that this is a trick question because really, how can I tell if it doesn't state exactly how much of the course she has already run, such as 1/2, 1/3 etc...

Can anyone help?

2007-01-28 15:29:01 · 8 answers · asked by brown eyes 3 in Mathematics

what is 5 = L in the GL?

2007-01-28 15:28:54 · 1 answers · asked by Sweetpea 1 in Mathematics

Is Earth really the 3rd rock from the sun? Can anyone provide me with a credible source that says so? Why would planet earth classify as a rock?!

Thank you! =)

2007-01-28 15:28:25 · 9 answers · asked by Sci-Buff 4 in Astronomy & Space

2007-01-28 15:28:22 · 3 answers · asked by Mr. Honda 1 in Mathematics

Chemisty...

2007-01-28 15:28:16 · 3 answers · asked by mattportner 1 in Chemistry

2007-01-28 15:27:41 · 20 answers · asked by Burke F 1 in Weather

2007-01-28 15:23:40 · 1 answers · asked by goring 6 in Astronomy & Space

If so, what? How can you account for it?

2007-01-28 15:21:31 · 5 answers · asked by RhondaJo 2 in Other - Science

2007-01-28 15:20:07 · 11 answers · asked by ldee1055 1 in Mathematics

i am doing a science fair project and i just need to know a little more information so if anyone can help me out i would really appreciate it thatnx:-)

2007-01-28 15:19:58 · 4 answers · asked by asia8592 1 in Weather

2007-01-28 15:17:37 · 4 answers · asked by goring 6 in Astronomy & Space

srsly.
the seeds are so small.

2007-01-28 15:16:52 · 6 answers · asked by GOD_DAMMIT. 1 in Botany

how do you do this integral?

integration [(x^8)/((4-x^2)^(11/2))dx]

2007-01-28 15:12:34 · 2 answers · asked by Anonymous in Mathematics

2007-01-28 15:12:02 · 4 answers · asked by Brian 2 in Mathematics

2007-01-28 15:11:39 · 3 answers · asked by Anonymous in Zoology

How many people pass it. what happens if you dont pass it? are you no longer a med student?If you pass the test what happens next what degree do you get M.D?

2007-01-28 15:11:29 · 1 answers · asked by avalentin911 2 in Medicine

How would I use radical expressions (math) in daily life? How would I set up the equation?

2007-01-28 15:11:19 · 1 answers · asked by CookFrNW 3 in Mathematics

2007-01-28 15:09:42 · 2 answers · asked by just-asking 1 in Geography

2007-01-28 15:09:27 · 4 answers · asked by Anonymous in Mathematics

x 2
xe /[1 +X]

2007-01-28 15:07:37 · 2 answers · asked by Anonymous in Mathematics