Science & Mathematics - 23 November 2006

...every single weapon on the planet? I know that's pretty wild, but I can dream, can I not?

2006-11-23 15:39:06 · 8 answers · asked by ? 6 in Astronomy & Space

Each of a set of 6 parallel lines cuts each one of another set of 5 parallel lines.Find which of the following numbers gives the correct number of different parallelograms so formed--60,120,150.

PLEASE PROVIDE SOLUTIONS TO JUSTIFY YOUR ANSWER AND USE ONLY THE PRINCIPLES OF PERMUTATIONS AND COMBINATIONS.NO OTHER METHOD IS ALLOWED EXCEPT FOR PERMUTATIONS AND COMBINATIONS.

2006-11-23 15:38:51 · 2 answers · asked by akar 4 in Mathematics

Solve 2^a + a = 3 .
Obviously , a=1 . But how can we solve it by calculation , not just graphical method or substition ( i.e. sub 1 into a ) ?

2006-11-23 15:34:58 · 5 answers · asked by Anonymous in Mathematics

3a+6b+4c+2d+5e+f=71

4a+b+5d+2e+3f=57

a+3b+2c+4d+5e+2f=69

4b+3c+d+6e+4f=76

2a+5b+5c+3d+4e+3f=86

a+2b+6c+4d+3e+3f=85

2006-11-23 15:25:04 · 5 answers · asked by Anonymous in Mathematics

2006-11-23 15:22:56 · 21 answers · asked by freddy197120032003 3 in Other - Science

Assuming we didn't use it to make just about everything we use, what would it be good for? What would mother nature do with a barrel of Krude?

2006-11-23 15:20:27 · 12 answers · asked by Raalnan5 2 in Biology

The equations given in the problem introduction can be added together to give the following reaction:

overall: .

However, one of them must be reversed. Which one?


The equations given in the problem introduction can be added together to give the following reaction:

overall: .

However, one of them must be reversed. Which one?

The equations given in the problem introduction can be added together to give the following reaction:
C2H4+H2O----C2H5OH
However, one of them must be reversed. Which one?
C2H5OH+3O2---2CO2+3H2O
C2H4+3O2---2CO2+2H2O

2006-11-23 15:19:42 · 1 answers · asked by diana t 1 in Chemistry

Mathematical definiton, please.

2006-11-23 15:12:53 · 5 answers · asked by Dante 2 in Mathematics

im 15 years old and i have noticed, mostly when i am resting on couch, chair, bed, exc, my heart will do like a flip flop (or flutter like) and sometimes out of the blue it will beat hard and fast with a hint of irregular beats for about 5 sec and stop. i do have small case of seperation anxiety in which i dont know if this is will relate to the irregular beats or not.. my mom and dad dont beleive me, my docter says my hearts okay without even checking, what can it be causing irregular beats? help.

2006-11-23 15:03:25 · 4 answers · asked by Anonymous in Medicine

196mm=how many inches? 98mm=how many inches? 78mm=how many inches? PLEASE and THANK YOU!!!

2006-11-23 15:00:21 · 5 answers · asked by Anonymous in Mathematics

2 moles of a compound are allowed to react in a foam coffee cup that contains 126 grams of water. The reaction caused the tempeature of the water to rise from 21 to 24.7 degrees Celsius. What is the enthalpy of this reaction? Assume that no heat is lost to the surrounding or to the coffee cup itself.

2006-11-23 14:56:49 · 4 answers · asked by diana t 1 in Chemistry

A chemist had 100 mL of a 40% acid solution. She wants to reduce the strength of the solution to 25% by adding distilled water. How much water should she add?

2006-11-23 14:56:01 · 5 answers · asked by usha_kaler 1 in Mathematics

I know that there's very little info on blackholes and they are still basicly theoreticle but in theory, what happens to light after it enters a blackhole?

2006-11-23 14:54:34 · 10 answers · asked by Anonymous in Astronomy & Space

2006-11-23 14:53:44 · 9 answers · asked by adam 1 in Other - Alternative

has the calvaria tree been propigated since the dodos extinction?

2006-11-23 14:53:28 · 1 answers · asked by Anonymous in Botany

2006-11-23 14:52:37 · 5 answers · asked by adam 1 in Other - Alternative

2006-11-23 14:51:21 · 2 answers · asked by Anonymous in Chemistry

I'm going to a convenience store, gas station, or I could go anywhere else, and I wanna buy something to power my Zippo lighter. Any suggestions?

2006-11-23 14:46:10 · 4 answers · asked by Jon 1 in Chemistry

Find the x-intercepts. y= x^2 - 7x + 7

Can someone show me the steps to doing this problem?

2006-11-23 14:46:08 · 8 answers · asked by George F 1 in Mathematics

2006-11-23 14:44:07 · 2 answers · asked by nisha 1 in Biology

2006-11-23 14:43:14 · 10 answers · asked by Kevin O 1 in Mathematics

Charles defined a new operation on pairs of ordered pairs of intergers as follows (a,b) and (c,d) = ac +bd divided by ab - cd. what is the value of (2,1) and (3,4)

2006-11-23 14:42:40 · 5 answers · asked by Anonymous in Mathematics

I have 4 items. I want to find out how many combinations of 2 items I can make without any duplication. For example, A and B is the same as B and A. I know I can just write out the combinations but if I have, say 100 items, this would be time-consuming.

2006-11-23 14:42:21 · 4 answers · asked by Inquiring Mind 19 3 in Mathematics

2006-11-23 14:40:16 · 6 answers · asked by probug 3 in Other - Science

for adding the fractions 4/15 , 1/12 and 3/8

2006-11-23 14:35:51 · 10 answers · asked by Anonymous in Mathematics

Hey,

I have this one calculus problem that asks to evaluate the following limit in other words find the limit.

The question is:

lim {1 - [ cuberoot(x+1) ] } / x
x->0.

How would I solve this, I have worked with complex conjugates before but they were just square root not cubic root. Is there some certain way or can I just apply the same concept of multiplying by complex conjugate?

Thanks!

2006-11-23 14:35:41 · 5 answers · asked by Bio-Gene 1 in Mathematics

2006-11-23 14:34:56 · 2 answers · asked by handsome 2 in Mathematics

2006-11-23 14:34:55 · 4 answers · asked by krishna b 1 in Earth Sciences & Geology

find the error. it's impossible
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did you know that 80% stanford students could not find the error above? repost this with the title "find the error" , and when you click post bulletin the answer will show really obvious

2006-11-23 14:29:01 · 13 answers · asked by hpersyn 2 in Other - Science

2006-11-23 14:24:50 · 20 answers · asked by crazzy 4 in Earth Sciences & Geology