Science & Mathematics - 1 October 2007

Prove :
the summation (sigma) of (n choose k) *5^k where k is odd and starts from 1 to n = ( 6^n - (-4)^n ) / 2

2007-10-01 20:24:56 · 2 answers · asked by Anonymous in Mathematics

2007-10-01 20:24:35 · 3 answers · asked by Anonymous in Astronomy & Space

I just want to make sure I have the answer right. The problem is:

5 (x - 2) -2x + 1
----------------------
3

The line obviously means the whole top part is divided by 3. Thank you!!

2007-10-01 20:08:45 · 12 answers · asked by Anonymous in Mathematics

Im having trouble doing trigonometric functions without a calculator. I want to get the answer in fractions not in decimals. Is there an easy way? if so can u please show some examples as well? greatly appreciated!

2007-10-01 20:07:02 · 3 answers · asked by sulekha47 1 in Mathematics

2007-10-01 20:03:27 · 3 answers · asked by alaa a 1 in Engineering

2007-10-01 19:56:20 · 3 answers · asked by Anonymous in Chemistry

Will you make it? SHOW ALL OF YOUR STEPS PLEASE!

2007-10-01 19:54:44 · 8 answers · asked by i <3 u 1 in Mathematics

Thats about it!

2007-10-01 19:48:10 · 4 answers · asked by Mic 2 in Zoology

pre cal prob

2007-10-01 19:42:15 · 3 answers · asked by Anonymous in Mathematics

2007-10-01 19:40:05 · 3 answers · asked by coolxy 1 in Chemistry

pre cal problem

2007-10-01 19:37:16 · 1 answers · asked by Anonymous in Mathematics

2007-10-01 19:30:49 · 1 answers · asked by Rajchem 2 in Chemistry

Well this is part of a much larger problem involving all sorts of polynomials anyway i am stuck on this one particular part which involves a cubic where you know 2 points and half the stationary point of inflection the points given are as follows:

[45,0] , [32,-20] and the stationary point of inflection occurs at [?, -7]

Basically ur supposed to find the equation for the cubic. is it possible to do this or have i overlooked something? The cubic is part of a much larger diagram involving all sorts of parabolas, semi-circles and ellipses which we need to find the formula for in order to create a computer generated diagram. if need be i can upload a picture of the diagram for u guys to look at if u think i might have missed something.

2007-10-01 19:27:35 · 2 answers · asked by Mitch 2 in Mathematics

2007-10-01 19:27:21 · 10 answers · asked by i <3 u 1 in Mathematics

Why is it that even at new moon (~Oct 1), high tide does not correspond directly to the Moon & Sun transit time (halfway between the set & rise times)?

"Gravity is bunk!" is not an acceptable answer. ;)

http://tidesandcurrents.noaa.gov/ofs/cbofs/cbofs.html is supposed to be helpful, but I cannot find specific relative information that would point me in the right direction.

Please help, thanks!

2007-10-01 19:26:25 · 4 answers · asked by Tiffany 1 in Astronomy & Space

2007-10-01 19:20:13 · 12 answers · asked by i <3 u 1 in Mathematics

I'm trying to find out when the winds/rain and snow started last year/beginning of this year for Washington State. Any ideas were I can find it?

2007-10-01 19:14:33 · 6 answers · asked by Louise 4 in Weather

I want to know if you were, for example, drinking from a glass and just kept drinking and drinking... is it dangerous for your body? Is it possible to somehow drown from this? (I don't mean by shoving your head in a bucket of water!).

2007-10-01 19:14:27 · 7 answers · asked by Nikita (Australian) 4 in Biology

Explain the physical reason.

2007-10-01 19:05:49 · 5 answers · asked by glamour girl 1 in Physics

The formulas r = 0.07t + 2.27 and w = 0.08t + 2.48 give an approximate model for the yearly average price r of a bushel of rye and w of a bushel of wheat over the past five years, where t is the number of years since 1994. What is the first year in which the price of rye exceeded $2.48/bu and the price of wheat exceeded $2.56/bu?

The price of rye exceeded $2.48 after 1997
The price of wheat exceeded $2.56 after 1995
Just need to verify that I got the right answers

2007-10-01 18:37:29 · 3 answers · asked by Lady E 1 in Mathematics

Let's say I have a rectangular prism with known dimensions... how do I find the length of a diagonal that goes from one vertex to another vertex directly across (if you don't know what I mean, I can try to clarify better).

2007-10-01 18:33:48 · 5 answers · asked by Anonymous in Mathematics

It's not Improperable but Properable. We could even be really tiny, maybe microscopic in a much larger world.
This video will blow your mind about the Universe:
http://www.youtube.com/watch?v=9ptdbNUtpx4

2007-10-01 18:28:29 · 10 answers · asked by James the Just 3 in Astronomy & Space

Help me..

2007-10-01 18:21:54 · 7 answers · asked by Anonymous in Physics

2007-10-01 18:21:13 · 3 answers · asked by christina e 1 in Mathematics

2007-10-01 18:20:47 · 3 answers · asked by albert o 1 in Mathematics

four times the sum of three consecutive integers is 180. what are the integers?

the sum of an integer and the next greater integer is at most 13. write an ineqality to find the lesser integer. then solve for the lesser integer

* i really don't get it so i would really appreciate help! please & thank you

2007-10-01 18:18:22 · 10 answers · asked by jmacsgirlie75 2 in Mathematics

My son has a Mead TeleStar Telescope with one 2x Barlow lens and one MH 9mm lens. Seeing the moon is no problem at all, so when I assembled the telescope and put the lens in, I found it very easily, especially the last couple of nights of the Harvest Moon phase. It was beautiful and extremely bright. However, those nights when I heard that Mars was visible, I could not adjust the telescope to bring it into view where it was visible enough to make it out. How can I do that so we can see the plantets or planet, close enough to were we can tell that it's Mars?

2007-10-01 18:14:42 · 7 answers · asked by Fee-Fee 3 in Astronomy & Space

M Theory

2007-10-01 18:14:22 · 4 answers · asked by engelfeurs 2 in Astronomy & Space

Find the normals to the curve xy+2x -y = 0 that are parallel to the line 2x + y = 0

this is from a quiz on implicit differentiation

2007-10-01 18:12:35 · 4 answers · asked by Nrisa-Gire N 1 in Mathematics

found outdoors in edmonton alberta, it has a face on his back, kinda looks like a devil! http://s228.photobucket.com/albums/ee36/spicer22/?action=view¤t=100_0267.jpg

2007-10-01 18:10:16 · 5 answers · asked by Anonymous in Zoology