Science & Mathematics - 7 November 2007

[ -1 5 9 -7 ]
[ 2 1 6 0 ]
[ 1 2 -4 8 ]

The question states tat I need to use gaussian elimination to calculate the determinant of the matrix.

This is what I get for the reduced matrx ( I cant seem to go any further )

[ 2 1 6 0 ]
[ 0 11/2 12 -7]
[ -3 0 -16 8 ]

Now how does this allow me to find the determinant more easily ? Thanks for your help

2007-11-07 16:23:06 · 2 answers · asked by Anonymous in Mathematics

Find the two points on the curve y = x^4 - 2x^2 - x that have a common tangent line.

2007-11-07 16:21:24 · 1 answers · asked by Anonymous in Mathematics

Find all values of x in the interval of [0 degrees, 360 degrees] that satisfy this equation

2 sin x =cos x

show the steps please!

2007-11-07 16:17:28 · 4 answers · asked by Nicky 2 in Mathematics

tonight some time

2007-11-07 16:16:43 · 4 answers · asked by tania_d_ann 3 in Astronomy & Space

2007-11-07 16:14:55 · 3 answers · asked by SimpleMe 2 in Mathematics

solve for x ._.
x^2 - x / 2x = 3 ^x
thanks : )

2007-11-07 16:14:34 · 2 answers · asked by Henry Chan 1 in Mathematics

67% of vehicles on the roads during rush hour are occupied by just the driver.

a) If you choose 380 vehicles at random, the mean number of vehicles that carry just the driver is ________ and the standard deviation is ________

b) If you choose 380 vehicles at random, the mean proportion of vehicles that carry just the driver is ________ and the standard deviation is ________


Please and thank you =)

2007-11-07 16:10:43 · 3 answers · asked by Anonymous in Mathematics

i need the width of an Elephant in meters, or using the metric system.

2007-11-07 16:10:04 · 2 answers · asked by none 2 in Engineering

How many kg of carbon dioxide are produced when 150 kg of glucose (C6H12O6) are fermented? C6H12O6->2C2H5OH + 2CO2.

2007-11-07 16:05:45 · 3 answers · asked by boazchic07 2 in Chemistry

2007-11-07 16:05:43 · 5 answers · asked by fiori3092 3 in Weather

My sister's husband passed over 2 years ago, she had her first date with a man Tuesday night, well her first date she thought would transpire into anything. When she came home, the phone rang, no one was there. The phone rang again, no one, she got this eery feeling both times when she picked up the phone. It was like he was giving her a signal that he knows that she went out, but he wasn't upset.
My mother-in-law died when my kids were very young. She died suddenly of a heart attack. She loved my kids, always wanting to see them. Well 2 weeks after she died, I had this real vivid dream. I drempt that I was sleeping , the phone rang, I woke up and went down stairs to answer it. It was my mother in law. I said to her, "Betty, you are dead". She said "I know, I was just wondering how the kids were". The dream was so vivid. Nothing was mixed up and out of order like other dreams. I think she was i
Just wondered if anyone else any kind of experiences with the telephone and the dead.

2007-11-07 16:04:59 · 7 answers · asked by Boo Radley 4 in Paranormal Phenomena

A closed rectangular box with a square base is to be built for a cost of $60. The material for the base costs $3 per square foot, the material for the top costs $2 per square foot, and the material for the sides costs $1 per square foot. What is the maximum volume of such a box?

2007-11-07 16:04:29 · 2 answers · asked by whoo_kidd1 1 in Mathematics

if an atom has 43 electrons, 56 neutrons, and 43 protons, what is its approximate atomic mass? what is the name of this element?

2007-11-07 16:03:21 · 8 answers · asked by Geanine J 1 in Chemistry

Please tell me how to do this problem
match the coefficient of determination to scatter diagram r^2=0.58

2007-11-07 16:02:00 · 1 answers · asked by Anonymous in Mathematics

5 sinx^2 - 2sinx=cosx^2

I need to see the steps please

2007-11-07 15:52:53 · 3 answers · asked by Nicky 2 in Mathematics

2007-11-07 15:47:50 · 6 answers · asked by Anonymous in Medicine

i was wondering if anybody believes ufos are from other galaxies? i'm a believer myself. I remember seeing a ufo when i was young but i never mention, i thought people would think i was day dreaming or something. It be nice if only ppl who is believers would answer.

2007-11-07 15:46:42 · 5 answers · asked by Anonymous in Astronomy & Space

do you know the animal named platypus it is very interesting

2007-11-07 15:41:23 · 9 answers · asked by Drake & Josh 2 in Zoology

The only place that I know of is Stone Rose in Republic, Washington. Does anyone know any close sights near Puyallup?

2007-11-07 15:38:38 · 6 answers · asked by David 2 in Earth Sciences & Geology

the human brain runs on an electrical pulse of about 60Hz from your heart, equivilant to 12 watts. When the bodies DNA begins to decay the energy released is thought to increase as much as 1000% or 12,000 watts. At death this charge is released and despersed.
Thermodynamics Law 2 says the energy will be despersed outward until it is acted upon by another force. Physics says law 2 can be circumvented in some instances where energy does not completely desperse, but rather coagulates in the local area to regenerate again. I.E. Lightning. Lightning stirkes the energy desperses into the atmosphere, coagulates and becomes lightning again. Would you say this is correct?

2007-11-07 15:38:34 · 13 answers · asked by nuff said 6 in Paranormal Phenomena

This question is in a practice test for a nursing program. The answer they cite is 5000. There are different answers to this problem depending on how you round off, but I haven't been able to get an even 5000...I'd be interested in seeing what everyone else gets as the solution.

2007-11-07 15:37:24 · 7 answers · asked by Mandy D 2 in Mathematics

assingnment for school

2007-11-07 15:35:40 · 3 answers · asked by j r 1 in Engineering

2007-11-07 15:35:23 · 2 answers · asked by Anonymous in Zoology

2007-11-07 15:34:02 · 4 answers · asked by R C 2 in Biology

Find a polynomial with the given degree n, lead coefficient 1, the given roots, and no other roots.
n = 3
roots 3, 4, -4

2007-11-07 15:31:41 · 2 answers · asked by Anonymous in Mathematics

is there any way i can solve for x in
log (x-1) = 1/2
w/o calc ?
thanks : )

2007-11-07 15:31:22 · 7 answers · asked by Henry Chan 1 in Mathematics

i need help w/ my geo page...

2007-11-07 15:29:31 · 5 answers · asked by SFBAG L0VER!! 1 in Weather

2007-11-07 15:24:50 · 6 answers · asked by Deenie 6 in Parapsychology

what's inverse of f(x)= x^(5) + 2x^(3) + x -1?

2007-11-07 15:24:05 · 2 answers · asked by remote control 1 in Mathematics

and how many points are needed to determine a line? (graph)

2007-11-07 15:23:15 · 6 answers · asked by Anonymous in Mathematics