Science & Mathematics - 26 August 2007

I'm stuck on this one section on my Algebra II/Trig summer assignment; the directions say "Write the fraction as a sum of terms." What does THAT mean? I tried searching the web for "sum of terms" but I get all these websites with confusing explanations. Can someone help me, please?

Example problem:

x^2 - 4x + 2 (fraction bar) x

^2 = second power/exponent 2

2007-08-26 18:42:21 · 3 answers · asked by alwaysconfused 2 in Mathematics

I am trying to find the meaning of neut for my son (7). It was a burning question at school. The clue was a type of sea creature and I believe the spelling is correct however no search of the internet or dictionary will bring up a meaning for this...please help....need to know tonight...

2007-08-26 18:40:55 · 5 answers · asked by T 3 in Zoology

The coherence length must be altered when passing through the fiber.So we must be able to determine certain characteristics like pulse dispersion or intensity variation using coherence length as one of the parameter.

2007-08-26 18:30:24 · 2 answers · asked by swarna l 1 in Physics

I have to show that, along the plane curve x=x_1(t)e_1 + x_2(t)e_2, that the curvature is

k = | x_1' x_2'' - x_2'x_1''| / [|(x_1')^2 + (x_2')^2|^(3/2) ]

The formula I've got for curvature is

||T’(t)|| / ||r’(t)||

But how do I get T(t) and r(t) with just x(t)?

2007-08-26 18:27:09 · 2 answers · asked by Albus 2 in Mathematics

14-sqrtx/sqrtx

2007-08-26 18:21:09 · 5 answers · asked by Splendidy 1 in Mathematics

2007-08-26 18:20:17 · 1 answers · asked by romeo d 1 in Engineering

find the equation of the parabola with its axis of symetry parrallel to the x-axis and which passes throught the points (3,3), (6,5) and (6,-3)

help?

2007-08-26 18:15:26 · 4 answers · asked by Anonymous in Mathematics

I'm over 18 and a guy...I was just wondering if I could purchase it just to have around for emergencies....which pharmacies actually carry it OTC?...Does anyone have an idea about how much it would cost?

2007-08-26 18:12:24 · 2 answers · asked by Anonymous in Medicine

2007-08-26 18:06:38 · 5 answers · asked by Anonymous in Mathematics

How does a reflector telescope that has a 19 inch tube have a 1400mm focal power and other reflector telescopes that have longer tubes have only 700mm. The 19 inch telescope claims to have a 1400mm focal length that is 55 inches long. Does this produce a higher degree of magnification than the 700mm with a longer tube?

2007-08-26 18:02:05 · 8 answers · asked by bill e 2 in Astronomy & Space

A small plane can fly 2400 kilometers in 10 hours flying into the wind. With the wind behind it,the plane can fly 3200 kilometers in 10 hours. What is the speed of the wind and the speed of the plane?

2007-08-26 18:00:33 · 6 answers · asked by N/A 4 in Mathematics

2007-08-26 17:56:41 · 5 answers · asked by Anonymous in Physics

A helicopter is flying over a lake and sights a boat at an angle of depression of 35 degrees. The water-surface distance from the helicopter to the boat is 2300 feet. Find the altitude of the helicopter to the nearest foot.





1610ft, 3285, 1319ft, 4010ft

2007-08-26 17:54:05 · 3 answers · asked by xlhollisterboi 1 in Mathematics

Please give a URL to a tutorial,or give me what materials to use.

2007-08-26 17:50:00 · 8 answers · asked by leianna_mae 2 in Chemistry

2007-08-26 17:44:37 · 5 answers · asked by mikesell 1 in Physics

no one has been able to give a good answer to these mysteries,its apparent that some form of intelligence created them but who and how?This really intresting seeing all of our so-called great minds trying to come up with a reasonable answer then come away scratching their heads.surely we can do better than that or can we?my answer is i dont think we are as advanced as we think we are inspite of all the advancements we have made. I really think the bible holds the key to these questions because noone has been able to discredit the bible and that may be why we argure about it so much is because we are just not intelligently advanced to understand it & we dont study it.But this could be the answer to many questions.

2007-08-26 17:43:51 · 11 answers · asked by Anonymous in Biology

Completing the square help?

how do i complete the square for the following? I can't figure any of these out, please show me all the steps!
1. (9x^2)+(25y^2) = 225
2. (9x^2)-(2y^2)+18 = 0
3. (y^2)-(6y)+(16x)+25 = 0
4. (2x^2)+(2y^2)-(10x)-18y = 1

2007-08-26 17:40:46 · 2 answers · asked by Anonymous in Mathematics

please help!

as clearly as possible.

thank you!

2007-08-26 17:27:05 · 6 answers · asked by Answer 2 in Mathematics

is mars really going to look the size of the moon tonight??

2007-08-26 17:26:35 · 8 answers · asked by Bayliegh 2 in Astronomy & Space

Ok, I want to understand this, I have the answer but I need to know why we got that answer, if we have a closed loop system with a given transfer function:

G(s) = 10 / (s+11)

What is the steady state output of the system when an input of:

2 cos (2t - 45)

is presented to the system.

the answer I have is 1.79 cos (2t - 55.3)

Please Explain, Thanx in advance.

2007-08-26 17:25:06 · 2 answers · asked by 037 G 6 in Physics

determine the stopping distances for a car with an initial speed of 95 km/h and human reaction time of 1.05, for an acceleration (a) a =-4.0m/s^2 (b) a=-8.0 m/s^2

2007-08-26 17:21:56 · 2 answers · asked by Anonymous in Physics

next time you will see this is the year 2287. planet mars is 34.65m miles from earth. this is what you are seeing.

2007-08-26 17:14:59 · 24 answers · asked by auntdscronies 2 in Astronomy & Space

for each a, there exist a unique real number 1/a.
*explain why this is not true.

2007-08-26 17:13:54 · 3 answers · asked by j;lkj;lkj;lkj;lkj 2 in Mathematics

Ok, I want to understand this, I have the answer but I need to know why we got that answer, if we have a closed loop system with a given transfer function:

G(s) = 10 / (s+11)

What is the steady state output of the system when an input of:

2 cos (2t - 45)

is presented to the system.

the answer I have is 1.79 cos (2t - 55.3)

Please Explain, Thanx in advance.

2007-08-26 17:13:15 · 2 answers · asked by 037 G 6 in Engineering

The rumored closeness of Mars for tomorrow (false) actually happened in 2003 - it was the brightest object in the sky - and the Lunar eclipse will occur Tuesday night-Wednesday morning (true). Have you planned to watch it?

2007-08-26 17:12:36 · 6 answers · asked by TitoBob 7 in Astronomy & Space

I am thinking about using these blueprints for my cooker. http://mysite.mweb.co.za/residents/net02833/makebox.htm

2007-08-26 17:07:13 · 2 answers · asked by Anonymous in Other - Science

I have this last problem for homework and I can't figure it out.

Consider a unit circle with an inscribed equilateral triangle. A chord is selected at random. What is the probability that the chord is longer than a side of the triangle?

Wouldn't it be very hard to measure how each chord that could be drawn to make sure it is longer than a side but less than the diameter.

2007-08-26 17:07:13 · 5 answers · asked by Anonymous in Mathematics

Our primary 3-phase voltage is 13.8 kv, secondary voltage on the transformer is 220 volt. Is it ok or correct to connect the (bushing) primary side of the transformer on one line of the 13.8 kv and connect the bolted primary side on the ground by using ground rod only? Assuming all the required parts are used such as lightning arrester, fuse, disconnect switch, etc.

2007-08-26 17:05:51 · 1 answers · asked by romeo d 1 in Engineering

I've already asked an algebra question just about five minutes ago, but i've encountered yet another difficult problem..so helP?

the problem is about simplifying algebraic fractions:
[(2) / (x-3)] * [(2x-6) / (8(x+4))]


Thanks

2007-08-26 17:03:35 · 3 answers · asked by Faye 1 in Mathematics

2007-08-26 16:55:09 · 2 answers · asked by jumba 1 in Mathematics