Science & Mathematics - 21 October 2007

The question is:
What is the minimum number of people you need, so that if you randomly select any two people from that group, there is a 50% chance that their birth dates will be the same?!!

2007-10-21 11:30:39 · 2 answers · asked by shish_101 3 in Mathematics

2007-10-21 11:30:04 · 2 answers · asked by Anonymous in Mathematics

2007-10-21 11:25:41 · 1 answers · asked by Anonymous in Astronomy & Space

2007-10-21 11:25:40 · 5 answers · asked by Anonymous 2 in Mathematics

2007-10-21 11:24:45 · 3 answers · asked by Anonymous in Biology

Does anyone know any interesting, funny catch phrases for the element Osmium.???

2007-10-21 11:22:21 · 1 answers · asked by Anonymous in Chemistry

the part where i circled...after the u-substitution and find out what their value is, what do u do next? can u plz guide me how to get those steps...

http://i181.photobucket.com/albums/x85/ctti_3/Untitled-83.jpg

2007-10-21 11:21:54 · 3 answers · asked by pnetecos 1 in Mathematics

find the average:

1. 2/3 + 3/5

2. 1/6 + 2/3 + 5/9

3. 11/4 + 5/2 + 7/3

4. 3/4 + 3 + 6/7

2007-10-21 11:21:46 · 10 answers · asked by Anonymous in Mathematics

2007-10-21 11:19:56 · 12 answers · asked by alejandra a 1 in Medicine

Only 4% of people have type AB blood.

a. On average, how many donors must be checked to find someone with type AB blood?

b. What is the probability that there is a type of AB blood donor among the first 5 people checked?

c. What is the probability that the first type AB donor will be found among the first 6 people?

d. What is the probability that the first type AB donor will be found on or after the 10th person checked?

e. What is the probability that the first type AB donor will be found on or before the 5th person checked?

2007-10-21 11:18:54 · 2 answers · asked by yohitslindah 1 in Mathematics

how do you show that the sum of two concave functions is also concave?

2007-10-21 11:17:48 · 4 answers · asked by Anonymous in Mathematics

2007-10-21 11:15:22 · 5 answers · asked by wildthing4956 2 in Chemistry

2007-10-21 11:15:02 · 5 answers · asked by henry j 1 in Mathematics

2007-10-21 11:14:28 · 3 answers · asked by Shivani P 1 in Botany

I don't understand this question let alone the answer. Is the sun at different positions every day? I thought it doesn't move? How can one tell when it's at south, north, at the equator, or Tropic of cancer or capricorn.

Here is the question with multiple choice
At noon on February 21, the sun is overhead at:

a, at the tropic of cancer.
b, at some point between the tropic of capricorn and the equator, heading southward.
c, at some point between the tropic of cancer and the equator, heading northward.
d, at the equator.
e, at some point between the tropic of capricorn and the equator, heading northward.

2007-10-21 11:13:24 · 3 answers · asked by do you smell..... what's coo 4 in Earth Sciences & Geology

Why is it possible to sublime caffeine?

2007-10-21 11:13:19 · 1 answers · asked by azncrazygurl520 1 in Chemistry

2007-10-21 11:12:20 · 2 answers · asked by arnold a 1 in Other - Science

I can't believe I'm asking this, because I should know this answer but I'm now doubting myself.

If a function goes to infinity as x approaches some real number, would we say the limit as x approaches that number is infinity or would we say that it does not exist?

Doesn't the limit always have to be a real number, but infinity isn't one?

So for example:
the limit as x approaches 0 from the right of 1/x is infinity or not defined?

2007-10-21 11:11:58 · 2 answers · asked by buck r 2 in Mathematics

When a piece of rabbit fur is stroked with a rubber rod the rod becomes negatively charged whereas a piece of silk stroked with a glass rod becomes positively charged. Why?
And what is a charged atom called?

2007-10-21 11:08:05 · 2 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-21 11:01:45 · 1 answers · asked by bob m 1 in Engineering

2007-10-21 10:58:59 · 4 answers · asked by hakim1125 6 in Zoology

2007-10-21 10:55:21 · 35 answers · asked by Hello 3 in Astronomy & Space

please help me solve this problem. i need the formula and what is given. i also need a step by step help to solve it. Please help me with anything you can. thanks :)

A man is pulling on his dog with a force of 70.0 N directed at an angle of +30.0 degrees to the horizontal. Find the x and y componets of this force.

2007-10-21 10:54:14 · 1 answers · asked by Anonymous in Physics

Any suggestions?

2007-10-21 10:52:24 · 2 answers · asked by shawn. 2 in Earth Sciences & Geology

A) bear
B) wheat
C) crayfish
D)mushroom
E) All of the choices can make organic molecules from water and carbon dioxide

2007-10-21 10:51:28 · 3 answers · asked by Anonymous in Biology

in an expression or an equation they are seperated by addition and subtraction signs..____

is it parentheses?

2007-10-21 10:51:12 · 5 answers · asked by AKR 2 in Mathematics

Sounds like an odd question, but I'm doing a science project.

Thanks btw.

And if it helps, I am talking about Migrating from Central Canada. Thanks again. =)

2007-10-21 10:49:29 · 2 answers · asked by xmorexthanxwordsx 2 in Biology

y''+cos(x)y'+3|x|y=0, y(2)=3, y'(2)=-1
Please explain.

2007-10-21 10:48:41 · 2 answers · asked by nemahknatut88 2 in Mathematics

An equilateral arch is drawn about an equilateral triangle with side length 9, dtermine the area of the equilateral arch.

2007-10-21 10:47:36 · 1 answers · asked by aha51806 2 in Mathematics

2007-10-21 10:46:50 · 2 answers · asked by velvetvoice04 2 in Earth Sciences & Geology