Science & Mathematics - 12 August 2007

My math book shows an example of vector cross products:
[1, 3, 4] x [2, -5, 8] = [4, -16, 10]

When I looked at it the answer didn't really make sense to me so I worked it out on paper and I got:
[44, 0, -11]

I thought, hmm....I wonder what I'm doing wrong so I punched it into my calculator and it gave the same answer as what I got.

What did I do wrong?

Here is how my book is working it out:
[1, 3, 4] x [2, -5, 8] = [(3)(8)-(-4)(-5), (-4)(2)-(1)(8), (1)(-5)-(3)(2)] = [4, -16, 10]

I'm completely lost here
Please help!

Thanks in advance

2007-08-12 08:52:16 · 4 answers · asked by Ryan N 2 in Mathematics

I think I know what DNA is, but what is a DNA hybrid system?

2007-08-12 08:50:23 · 2 answers · asked by Elizabeth A 1 in Other - Science

2007-08-12 08:47:07 · 26 answers · asked by Matt B 3 in Astronomy & Space

Im just a 15 year old kid and im not a scientist or etc. Im just a kid that is curious whats around me and what is out there. Aliens from other planets are likely a threat to us.

UFO/alien topic will be serious someday. In my own definition, I think Aliens from other galaxy and civilization are "nephilims or fallen angels" that betrayed God due to their issues of free will, lust, pride, or the incomprehensibility of the acts of God.

"Genesis 6:4": There were nephilims in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown.

Nephilim are considered by some to be supernatural beings, specifically the offspring of human women and “sons of God”
Both interpretations say that the lustful breeding of the Nephilim was one of the provocations for Flood, which is also referred to as the Deluge.

Thats my opinion about aliens. :)

2007-08-12 08:46:52 · 9 answers · asked by shoCkey 3 in Astronomy & Space

2007-08-12 08:46:28 · 2 answers · asked by turtle chick 1 in Mathematics

2007-08-12 08:45:16 · 2 answers · asked by Anonymous in Chemistry

I need someone to check my answer of

Point 1: (0, -1)
Point 2: (0,-1)

If this is incorrect, please explain with detail how to solve for this. Thank you.

2007-08-12 08:44:02 · 4 answers · asked by ? 1 in Mathematics

2007-08-12 08:42:32 · 3 answers · asked by nbonagas 2 in Mathematics

Factor the polynomial completely. If the polynomial cannot be factored, write prime.
x^2 + 30x + 225

(x + 15)^2
(x + 15)(x - 15)
(x - 15)^2
prime



Problem 2

Factor the polynomial completely. If the polynomial cannot be factored, write prime.
18y^2 + 81y - 45

(18y - 9)(y + 5)
9(2y - 1)(y + 5)
9(2y + 1)(y - 5)
prime

2007-08-12 08:40:44 · 2 answers · asked by Anonymous in Mathematics

2007-08-12 08:37:55 · 11 answers · asked by Anonymous in Physics

The Alternative section includes:
- Paranormal Phenomena
- Parapsychology
- General - Alternative

Do you believe it belongs to Science & Mathematics? Why or why not?

2007-08-12 08:32:32 · 7 answers · asked by Anonymous in Other - Science

2007-08-12 08:29:56 · 7 answers · asked by Anonymous in Physics

I'm assuming that putting the spacecraft at the top of a tower of boosters will help. I know many refer to Orion as "Apollo on steroids", and that the design is similar, although larger. I think I read that the bottom of the Orion capsule will have one big shield, similar to Apollo. But will "shuttle-style" tiles still be needed on the sides of the capsule? (I know that most of the heat of re-entry is on the bottom of the ship, but certainly some protection is needed elsewhere.) If tiles are needed, does the simpler design of a capsule allow for more standardized tiles, rather than the very precise size/shape and jigsaw-type assembly of the shuttle's tiles?
Thanks.

2007-08-12 08:29:26 · 5 answers · asked by IWriteSF 1 in Astronomy & Space

2007-08-12 08:28:18 · 20 answers · asked by Anonymous in Mathematics

Also do you believe in time travel in the future and if yes how do you think we will be able to do it?

2007-08-12 08:21:25 · 10 answers · asked by Dr OXO 2 in Physics

If a compound causes cancer-cell apoptosis in vivo, how likely is it to do the same in vitro?

2007-08-12 08:19:08 · 3 answers · asked by skybluu 2 in Biology

I need to round to the nearest hundredth.

2007-08-12 08:11:58 · 7 answers · asked by casper5 3 in Mathematics

i personally don't. i only believe to an extent, that our earth is round. even its journey round the sun is believable, but not the milky way, or beyond that. it is pure exaggeration. what do you feel?

2007-08-12 08:11:30 · 17 answers · asked by Seungyong W 5 in Earth Sciences & Geology

Penguins are from the south pole. Penguins and polar bears are from opposite ends of the earth. It is more likely to find a polar bear running with lions in Africa that for a penguin and a Polar bear to be together.

2007-08-12 08:11:23 · 9 answers · asked by ron m 1 in Earth Sciences & Geology

yes i allready know it would have to have a very long stick

2007-08-12 08:10:57 · 15 answers · asked by pj 3 in Astronomy & Space

... will it ever reach Earth?

If so, when? If not, why?

What about artificial satellites?

2007-08-12 08:09:03 · 12 answers · asked by HandsOnCelibacy 4 in Astronomy & Space

not sure how it's spelled but i heard this today. but couldnt ask because of time.

whats does the name mean an why do call Earth the name earth if its not the real name?

2007-08-12 08:08:51 · 6 answers · asked by Anonymous in Astronomy & Space

Simplify the following algebraic expression:
3(k + 7) + 4

Simplify the following algebraic expression:
3(2a - b + 2z) + 3

2007-08-12 08:02:33 · 6 answers · asked by Anonymous in Mathematics

a. CH3CH2CO2CH3
b. CH3CH2CO2H
c. CH3CH2CH(OH)OCH3
d. CH3CH2CH(OCH3)2

2007-08-12 08:00:39 · 3 answers · asked by dave b 2 in Chemistry

2007-08-12 07:59:34 · 8 answers · asked by Chibi Neko 2 in Other - Science

of a weak nucleophile with the carbonyl group of an aldehyde or ketone?

a. I–
b. H3O+
c. AlCl3
d. BF3

2007-08-12 07:58:56 · 2 answers · asked by dave b 2 in Chemistry

A decimal with an endless series of 3's added by itself should be a decimal with an endless series of 9's. That is, 0.333... times 3 should equal 0.999..., but it equals 1.

Why?

2007-08-12 07:54:26 · 4 answers · asked by HandsOnCelibacy 4 in Mathematics

2007-08-12 07:51:40 · 2 answers · asked by John S2005 3 in Astronomy & Space

In / /ABCD, the measure of show work plz

Thank you so much!

2007-08-12 07:49:45 · 2 answers · asked by Anonymous in Mathematics

(-6,2), (2,0), (-10,-3), (-18,5) are solutions for the equation x+4y=2?

I have tried to solve this problem and I cannot figure it out. I have never had an Algegbra class before now and I am really lost. If you could show the work so I can take notes, would be greatly appreciated. Thank you.

2007-08-12 07:48:44 · 4 answers · asked by ? 1 in Mathematics