Mathematics - 27 November 2007

2007-11-27 23:54:05 · 5 answers · asked by Joel K 2

rumor spread this integral can be also evaluated by means of complex numbers; please show work as I’m quite unaware how to do it this way;

2007-11-27 23:13:12 · 3 answers · asked by Anonymous

Anyone willing to show me how to do this one?Thanks!

2007-11-27 22:43:10 · 3 answers · asked by Anonymous

use de moivre's theorem to solve z^5=1

please help me, im so lost!
thanks!

2007-11-27 22:08:09 · 6 answers · asked by Anonymous

find the 2 tangent vectors to:
X = (cosh(A)cos(B) , cosh(A)sin(B) , sinh(A)) at A=B=1
hence find the tangent plane at this point

2007-11-27 21:23:20 · 1 answers · asked by dposters 1

y = xsqrt(2-x^2)

2007-11-27 20:45:47 · 4 answers · asked by xìn xīn 1

I'm taking Numerical Analysis right now, and my current section is Stiff Differential Equations.

I'm proving that the Implicit Trapezoidal method is A-stable.

In the end of the proof, this is what it says:

|Q(hk)| < 1 when Re(hk) < 0.

Notice that "hk" is just a product of two constants.

SO, "Re" is most likely a function.

Does anyone know what "Re" or "Re()" is? Please help.

2007-11-27 20:43:10 · 2 answers · asked by Anonymous

A pulley of radius 20 cm turns at 6 revolutions per second, what is the linear velocity of the belt driving the pulley in meters per second?

Is 753.98m/s the solution?

2007-11-27 20:29:08 · 2 answers · asked by hp 1

This needs to be in terms of sine using f(x) = A sin (x + Z)

2007-11-27 19:42:51 · 2 answers · asked by xxurdownfallxx 2

2007-11-27 19:39:52 · 7 answers · asked by Mzamo Z 1

2007-11-27 18:48:42 · 3 answers · asked by xxurdownfallxx 2

2007-11-27 18:16:51 · 10 answers · asked by Kels 2

Please write in Algebraically method?
2x-3y+z=13
x-2y-z=6
5x+y+z=14

2007-11-27 18:07:28 · 6 answers · asked by I Rock! 1

This is the link of the problem:
http://s141.photobucket.com/albums/r77/rocketllamafootie/?action=view¤t=scan0011.jpg

2007-11-27 17:23:33 · 1 answers · asked by Anonymous

Hi I've been struggling with this problem and I would really appreciate any help or hints anybody could give me.
-----------

Let (X,d) and (Y,p) be metric spaces and
f:X->Y is a continuous function

Suppose C is a compact subset of X such that:

the restriction f|_C: C->Y is injective and for each x in C there exists a real number r(x)>0 such that, on the open ball (neighborhood) with radius r(x) around x consists of all x' in X such that d(x,x')
i.e. B(x,r(x))={x' in X|d(x,x')
and the restriction f|_B(x,r(x)):B(x,r(x))->Y is injective.
--------
prove that there exists a real number R>0 such that on the open subset G of X where G consists of the Union of all open balls of radius R centered at x

[i.e. B(x,R)] for all x in C
G=U_(x in C) B(x,R)

That the restriction f|_G: G->Y is injective
-----------
Thank you so much for taking the time to help me

2007-11-27 17:19:54 · 1 answers · asked by greeneggs4spam 3

i got x=-1 and i did the problem twice but my teacher still counted -1=x as the wrong answer. is there another one? someone mind helping me out here?

2007-11-27 16:48:51 · 9 answers · asked by Anonymous

the first half is identically equal to the second half and NOT equal to the second half

2007-11-27 16:47:35 · 1 answers · asked by Anonymous

2007-11-27 16:46:21 · 5 answers · asked by pamela w 1

Hello guys,

Well, functions have me completely stumped. I am currently bluffing my way through Algebra I (advanced, 8th grade =/), and we hit functions yesterday - they have me completely stumped.

Specifically linear functions. It goes without saying (right?) that exponents, variables/constants in fractions, multiplying y and x, etc. disqualify them as linear functions, correct?

Regardless - I need help.

4y-2x=0

"Tell whether each function is linear. If so, graph the function."

So basically, I know it is linear, and I know how to graph - where do I go from there? The Algebra I teacher is a cool guy, he got us started on y=mx-b a long time ago, but I never under stood. I THINK I have to get y on its own, just like any equation's variable.

So would it be

y-1/2x=0? Where would I go from there?

/dying

By the way - why use (f)x, instead of y? I never understood - in some later stage of math, do the extra variables help you plug in factors and what not?

2007-11-27 16:41:24 · 5 answers · asked by Anonymous

parabola, and sketch

(x+8)^2 = 8(y+1)

thanks if you can help
this is on a practice test and no anwers were given.

2007-11-27 16:38:40 · 1 answers · asked by Boo Radley 4

Solve by factoring: x^2 +3x - 18 = 0? can you also show me the steps by which you arrived at your answer?

2007-11-27 16:35:51 · 16 answers · asked by Sean 1

2007-11-27 16:35:38 · 7 answers · asked by nolove4math 1

Hello! I really need help on my Alg. II Hw because I don't understand it! It's a Standardized Test Practice and here are the 5 questions I need help with!

1) If it takes 6 hours for 2 people to clean a house, how many hours will it take 4 people, working at the same rate, to clean another house that is the same size?
A. 2/3 hours
B. 1 1/2 Hours
C. 2 Hours
D. 3 Hours

2) What is the value of r^3 if 1/r= square root of 0.01?

3) For what integer value of m is 2m + 14> 42 and 5< m/4 + 3 < 7

given a>3 and b< -4 Solve:
a+b/a b/a +1

Ugh!
Algebra Kills me!
Please Help!!

2007-11-27 16:34:13 · 5 answers · asked by upsetness 2

i was told a answer along time ago and wondered if it was right

2007-11-27 16:27:58 · 16 answers · asked by roadcruisers 1

Determine if the vectors v = (2, -2, 1) , u = (1, 1, 1) , w = (1, 0 ,1) are linearly independent or linearly dependent.
(Also please tell me a good website to learn this stuff easily, cuz my book is complicated and professor too :(

2007-11-27 16:22:19 · 3 answers · asked by Anonymous

Other then the educational requirements, what are the personal characteristics of a mathematician?

2007-11-27 16:21:51 · 10 answers · asked by jane 1

Then name the solution set and explain how to draw the graph of the solution set on a number line.
5(1-t) > 4(3-t)

2007-11-27 15:30:54 · 2 answers · asked by Alley 1

this question was on my quiz and i got it wrong, but im still not sure how to figure it out.

Solve in the interval 0 degrees less than or equal to "x" less than or equal to 360.

sin2xsinx - cos2xcosx = 1


thank you all very much!

2007-11-27 15:23:37 · 1 answers · asked by Vivian H 1

i need to know what units are used for Avogadro's number. if you can answer this question then thank you soooooo much!!!! (i don't think it's grams or anything like that)

2007-11-27 15:18:54 · 8 answers · asked by Layla 1

This formula could demonstrate the height (in feet) from which a person would have to fall to hit their head in a car crash at say 2, 5 or 10 mph.

2007-11-27 15:15:38 · 5 answers · asked by Anonymous