Science & Mathematics - 27 September 2007

2007-09-27 17:09:24 · 2 answers · asked by S i r i 1 in Medicine

3 fractions that equal 1/4?
i need 3 fractions that equal 1/4

example - 1/4= 1/x +1/x + 1/x

2007-09-27 17:03:21 · 7 answers · asked by Anonymous in Mathematics

2007-09-27 17:02:15 · 4 answers · asked by speechiscruel 1 in Astronomy & Space

f(x)=3x

Evaluate the function when x=2, x=0, and x=-2

Please show all steps, and if you can, tell how you got that answer please and thank you.

2007-09-27 16:58:39 · 5 answers · asked by Anonymous in Mathematics

I live in florida and i never want to be in a# 2 no higher the last time no eletric for 4 weeks uh!

2007-09-27 16:51:34 · 3 answers · asked by daiberino 2 in Weather

I'm just curious.

2007-09-27 16:47:56 · 10 answers · asked by ? 3 in Medicine

Can someone explain to me how to determine the significant figures? And how to determine the sig. figs. in addition, subtraction, multiplication, and division. I know that the rule for determining the sig. figs. is different in adding and subtracting than it is for multiplying and dividing, but can someone explain the method please.

Thank You.
=]

2007-09-27 16:43:52 · 2 answers · asked by late.dawns 2 in Chemistry

No obstructions, flatland. At approximately what distance would a vehicle be a dot? At approximately what distance would one be able to distinguish it as a vehicle?

2007-09-27 16:43:05 · 1 answers · asked by sebastian 2 in Physics

I am investing in stocks and i am trying to make a somewhat orginized paper with many details about the stock. I was wondering what i would have to do to find out how much a stock has grown (percentage wise) over a 52-week period. I will use GOOG as an example, 52 weeks ago it was at 400.25 and now it is at 567.5, how would I find out how much the stock has grown(percentage wise)? ex. it has grown 15% over the past year. that sort of form

2007-09-27 16:42:39 · 1 answers · asked by deb1033 2 in Mathematics

4 + [8 /x] + [4 /(x^2 )],
find F'( x ) ____

Then Find f'( 1 ) ___

2007-09-27 16:39:41 · 4 answers · asked by Anonymous in Mathematics

2007-09-27 16:39:29 · 4 answers · asked by Scarlet 1 in Physics

f(x)= -x²+11x-28

I know I'm supposed to solve for

-x²+11x-28=0

But I'm stuck at

-x²+11x=28

What am I supposed to do after that?

2007-09-27 16:38:01 · 8 answers · asked by Anonymous in Mathematics

prove the following identities: (n choose 0) - (n choose 1) + (n choose 2) -(n choose 3) + .......(-1)^n (n choose n) = 0

(n choose 0) + (n choose 2) + (n choose 4) + (n choose 6) +.......(n choose n)= 2^n-1 if n is even.

probability questions: A bridge hand consists of 13 randomly chosen cards from 52. What's the probability that a bridge hand consists of 4 clubs, 4 diamonds, 3 spades, and 2 hearts?

i got (13 choose 4)(13 choose 4)(13 choose 3)(13 choose 2) all divided by (52 choose 4). which i got to equal 1.795%. Not sure if that is right.

If a bridge hand consists of 4 clubs, 4 diamonds, 3 spades, and 2 hearts. Whats the prob. that they happen to fall in this order?

I was thinking (13 C 4) / (52 C 4) times (13 C 4) / (52 C 4) times (13 C 3) / (52 C 4) times (13 C 2) / (52 C 4). I dont think i did this right at all, but i could be wrong.

Thanks a lot for any help or suggestions.

2007-09-27 16:35:55 · 3 answers · asked by manofsteel322 1 in Mathematics

2007-09-27 16:33:54 · 2 answers · asked by Anonymous in Earth Sciences & Geology

If a washing machine's drum has a radius of 25 cm and spins at 3.9 rev/s, what is the strength of the artificial gravity to which the clothes are subjected? Express your answer as a multiple of g.

2007-09-27 16:33:46 · 2 answers · asked by Anonymous in Physics

. Express sec x - sin x tanx in terms of cos X


i just cant seem to get to cos x and ive tried everything i can think of. any ideas?

2007-09-27 16:33:38 · 5 answers · asked by pinkfloyd6488 2 in Mathematics

a) area of the rectangel and indicate if your answer shows increase, decrease or neither in its rate of change.
b) perimeter of the rectangle and indicate if your answer shows increase, decrease or niether in its rate of change.

answer
a) 14 cm^2/sec(increase)
b) 0 cm/sec

please explain how the get the answer

2007-09-27 16:28:12 · 5 answers · asked by fvsdf s 2 in Mathematics

The present dimensions of the candy bar are 15 cm in length, 6 cm in width, and 2 cm in thickness. The CEO has asked your consulting firm to come up with the best way to shrink the candy bar. Because millions of dollars are riding on this decision you will need to find all answers in centimeters correct to three decimal places.

6. Consider reducing two (but not three) of the dimensions by the same number of cm. What would the new dimensions be in each case? (There are three possibilities; in each case you want the volume to be 15% less than the original volume. (i.e., you want it to have the volume found of 153.)

7. Consider reducing all three dimensions by the same number of cm. What would the new dimensions be? (Once again, you want the volume to be 153.)

2007-09-27 16:27:55 · 1 answers · asked by steven m 1 in Mathematics

2007-09-27 16:27:43 · 2 answers · asked by Anonymous in Chemistry

a pole cast a shadow of 15 meter long when the angle of elevation of the sun is 61 degree. If the pole has leaned 15 degree from the vertical directly toward the sun, what is the lenght of the pole?

2007-09-27 16:21:25 · 2 answers · asked by HGA 3 in Engineering

answers please ?

2007-09-27 16:18:33 · 7 answers · asked by hello 1 in Earth Sciences & Geology

A 4.8 kg object is suspended by a string from the ceiling of an elevator.

Acceleration of gravity= 9.8 m/s^2

a) Determine the tension in the string if it is accelerating upward at a rate of 0.8 m/s^2.

b) Determine the tension in the string if it is accelerating downward at a rate of 0.8 m/s^2.

Answer in units of N.

2007-09-27 16:16:16 · 2 answers · asked by Anonymous in Physics

4 compounds that you recognize or can determine with the help of your book: list their name, formula, and what the compound was found in.
please help me

2007-09-27 16:11:37 · 1 answers · asked by Anonymous in Chemistry

If you were on a 26.9 degree slope and an avalanche started 450 m up the slope, how much time would you have to get out of the way? Answer in s.

2007-09-27 16:11:32 · 1 answers · asked by Anonymous in Physics

what types of agriculture is most linked to areas with the densest population? how does this account for the large numbers of people in these regions

2007-09-27 16:10:29 · 1 answers · asked by Anonymous in Earth Sciences & Geology

http://www.newscientist.com/article.ns?id=mg19125591.500&print=true
does this mean god is no longer special?
and....... doesn't the picture look like a black hole and a worm hole that is theoretically created then breaks because of thermodynamic law violation?

2007-09-27 16:09:36 · 6 answers · asked by Mercury 2010 7 in Astronomy & Space

whats the area of a circle with a radius of 15??? if no can anwser i need it soon home work do tomarow i can look in da back of the book but i wanted to c if any one knew. i dont like when yunger people know it an i dont lol

2007-09-27 16:09:13 · 4 answers · asked by eddie 1 in Mathematics

why do saltwater fish die when placed in fresh water??..sadly my mom was no help..can u guys please be??...hehe..thanks

2007-09-27 16:08:43 · 4 answers · asked by @DRi_LOCZ 1 in Biology

2007-09-27 16:06:06 · 2 answers · asked by Billy H 1 in Mathematics

2007-09-27 16:03:35 · 3 answers · asked by Clueless18 1 in Earth Sciences & Geology