Science & Mathematics - 8 October 2007

2007-10-08 08:37:07 · 3 answers · asked by Anonymous in Zoology

The parametric equations of the line of intersection of the two planes
2x+8y+8z=8 and –2x–7y–5z=4
found by Gauss-Jordan elimination are
x= _____+___t
y=______+___t
z=______+___t

2007-10-08 08:34:58 · 2 answers · asked by Anonymous in Mathematics

2007-10-08 08:34:16 · 1 answers · asked by Terry B 1 in Engineering

2007-10-08 08:34:10 · 4 answers · asked by jess 2 in Astronomy & Space

Let l be the line that passes through the point P=(2,3,9) and is parallel to the line with parametric equations
x= -9+7t
y= 9+5t
z= 8 -9t
The vector equation of l is x=p+td where
p=(___,____,_____)T
d= (___,____,_____)T

2007-10-08 08:32:49 · 1 answers · asked by Anonymous in Mathematics

if the question says.....Degree of the polynomial 8x^2y...

^means power((exponets))

wuld it b 2 or 3 im really confused...

2007-10-08 08:31:11 · 1 answers · asked by Stephen 2 in Mathematics

and F0 is the preload. Determine the work required to compress a spring whose spring constant k=200 lbf/in a distance of one inch starting from its free length where F0=0 lbf. Express in lbf ft and Btu.

2007-10-08 08:29:17 · 2 answers · asked by s4_orce 1 in Engineering

2007-10-08 08:28:33 · 23 answers · asked by fabizilla 1 in Earth Sciences & Geology

each year in order to save 122000 in 14 years for a child's college expenses? Assume the annual amount is added continuously over the period of each year.

2007-10-08 08:28:16 · 4 answers · asked by simonkf2002 1 in Mathematics

What's the answer for the equation:
the square root of 3+4i = a+bi

This is what I got so far:
I squared both sides to get rid of the square root and it becomes:
3+4i = (a+bi)(a+bi).
Then: 3+4i = a (squared) + 2abi - b (squared)
Then: 3+4i = a (squared) + b(squared) + 2abi
So the real numbers equal each other and the imaginary numbers equal each other: a(squared) +b(squared) = 3 and 4 =2ab.

But when I use substitution, I get 4 really weird answers and I'm not sure if they're correct or not.
I got [(+ or -) 2 (+ or -) i] and [(+ or -) 1/i (+ or -) 2]
Are these correct?

2007-10-08 08:26:01 · 2 answers · asked by Anonymous in Mathematics

2007-10-08 08:25:05 · 4 answers · asked by Mohammad BAT 1 in Geography

Given the expression (h-4)/(sqroot of h - 2)
simply by ratinalization and simplify, evaluate the expression for h=4.

i dont understand. can some one help.

2007-10-08 08:24:43 · 2 answers · asked by ♥ AnGeL ♥ 3 in Mathematics

2007-10-08 08:24:28 · 11 answers · asked by michaelsd_94 1 in Weather

this was in the continuity chapter and i don't understand it. i know it is true, but i am not sure how i am supposed to justify.

2007-10-08 08:24:23 · 1 answers · asked by Anonymous in Mathematics

Find a unit vector with positive first coordinate that is orthogonal to the plane through the points
P = (-4, 5, 4), Q = (-1, 8, 7), and R = (-1, 8, 8)
Thanx guys. I have trouble solving it.

2007-10-08 08:23:42 · 1 answers · asked by Anonymous in Mathematics

By all accounts tigers will be extinct in the wild very soon. Who is truly working to halt this?

2007-10-08 08:23:01 · 2 answers · asked by radiant_innerlight 3 in Zoology

Proof that, for all z, w an element of C (complex numbers);

| z + w | <= | z | + | w |

(<= means less or equal to).

Thanks for the help.

2007-10-08 08:22:16 · 3 answers · asked by thehill88o 1 in Mathematics

what is 'a'

2007-10-08 08:21:52 · 4 answers · asked by Anonymous in Mathematics

Calculate the grams of O per one gram of sulfur in sulfur dioxide and sulfur trioxide and use the data to illustrate the Law of Multiple Proportions
explain and show please?

2007-10-08 08:21:05 · 1 answers · asked by JitterBug589 3 in Chemistry

I am doing this problem to study but am stuck and would like to know how to do it.

What is the density of hydrogen gas at 19.0 C and a pressure of 1670 psi?

2007-10-08 08:20:19 · 2 answers · asked by Jared W 2 in Chemistry

Why must fish farmers run large aerators all night long during the hot summer months, especially when there are a lot of algae in the pond? Aerators agitate (splash) the water increasing the surface area allowing more oxygen to diffuse into the water and more carbon dioxide to diffuse out. They generally don't have to do this in the winter or in the daytime, just summer nights. Part of the reason has to do with warm water holding less oxygen than cold water. ...has to do with the algae and photosynthesis.

2007-10-08 08:18:44 · 2 answers · asked by HowDoUGetOut 1 in Botany

2007-10-08 08:14:36 · 2 answers · asked by Anonymous in Physics

Is it fair, right and okay to build a physics project using a how to build your own guide. My teacher said we can't buy any kits that have all the materials ready to build but is it okay to buy a guide explaining how to build it if they give us the materials. Is it still moral and right. I am having trouble with this. Please Help!!!!

2007-10-08 08:13:07 · 7 answers · asked by mc_vikram21 1 in Engineering

The first answer that come to the mind is that the grasses are wind-pollinated, with the ability to spread pollen to other grasses. But why would grasses release so much more pollen THAN the insects/birds does?

2007-10-08 08:12:51 · 2 answers · asked by Jo 3 in Biology

2007-10-08 08:12:39 · 5 answers · asked by venus_farahani 1 in Medicine

Convert this to meters per second.

2007-10-08 08:11:57 · 7 answers · asked by redbeetlebug00 1 in Mathematics

Is it "atom"?
is it "compound"?
is it "element"?
or "molecule"?

2007-10-08 08:06:49 · 15 answers · asked by Anonymous in Physics

2007-10-08 08:06:32 · 3 answers · asked by Anonymous in Mathematics

4X / [X^2 - 1]^1/2

So that is 4X over square root of (Xsquared) minus 1.

2007-10-08 08:04:44 · 4 answers · asked by Anonymous in Mathematics

How did this happen?
x^3-2x^2-3x
=x(x^2-2x-3)
=(x-3) (x+1) <---

How did it become =(x-3) (x+1)?
Please explain easily, because this equation is very annoying, especially when I dont understand how the answer happened...

2007-10-08 08:04:00 · 5 answers · asked by Anonymous in Mathematics