Mike

ok, i spent way too much time and still can't get this one

sum n=1 to inf of 1/(n(n+1)(n+2))

The answer I think is 1/4

when I solve for partial fraction, I get

(1/2n)-(1/(n+1))+(1/2(n+2))

.....

and that's it....it's not working (*&$%(*^

i went up to the 10th term, and stuff still doesn't cancel..

(1/2-1/2+1/6)+

(1/4-1/3+1/8)+

(1/6-1/4+1/10)+

(1/8-1/5+1/12)+

(1/10-1/6+1/14 )+

(1/12-1/7+1/16)+

....

I don't even see a pattern...

I see that the -1/(odd number) does not cancel out, and that some of the positive numbers get cancelled out, but still...there are two positve for ever negative, and only the even negatives help!

I can do telescoping series with 2 partial with no problem, what am I missing here?

thanks

PS: please reply only if u know how to do this, i don't need answer/work just explanation

thanks

ok, I'm am blanking out on why

u'(t)/u(t)=ln(u(t))'.....du(t)/dt/u(t)=d/dt ln(u(t)) (same thing, different format)

this is the part where you prove that e^intergral(p(t))dt is the integrating factor

I know this is a really simple question, but for some reason I can't see why it is (ln(u(t))'

thanks

http://img443.imageshack.us/img443/1489/24263949.p...

the answer should be 133/13, I'm don't know why my way doesn't work, can someone explain it to me?

Thanks

Really annoying me....

The question is y=3x^(lnx) what is y'

the answer is (6lnx*x^ln(x))/x

The way I did it was 3e^(lnx^lnx)=3e^(lnx)^2=3e^(lnx)^2*2lnx/x=(6lnx*x^ln(x))/x

but I can't do it using log diff T_T

I did

lny=ln3x^lnx

y'/y=lnx*ln3x

y'/y=lnx/x +ln3x/x

y'/y=lnx/x + ln3/x +lnx/x

y'/y=2lnx/x +ln3/x

y'=(2lnx/x+ln3/x)3x^lnx

The problem is the ln3/x...I don't know why it isn't canceled T_T

plz help !

Thanks!

http://answers.yahoo.com/question/index;_ylt=AhE0V...

Last time I checked I had two votes,

Now I don't have any votes, plus I can't vote at all...

I thought that anyone could vote for one answer right?

How come I can't vote?

and why are the vote counts wrong?

To live alone one must be a beast or a god, says Aristotle. Leaving out the third case: one must be both -- a philosopher

What exactly does it mean...don't quite understand what it is saying :(

can someone please point me to a site or explain to me what Nietzsche means?

Thank you

To live alone one must be a beast or a god, says Aristotle. Leaving out the third case: one must be both -- a philosopher

What exactly does it mean...don't quite understand what it is saying :(

can someone please point me to a site or explain to me what Nietzsche means?

Thank you

To live alone one must be a beast or a god, says Aristotle. Leaving out the third case: one must be both -- a philosopher

What exactly does it mean...don't quite understand what it is saying :(

can someone please point me to a site or explain to me what Nietzsche means?

Thank you

you know how people complain that Crysis requires a high end computer?

What is considered high end?

I am able to play Crysis at 1680*1050 with all very high setting with NO LAG AT ALL. The computer I built was below $900...

here are my parts:

http://www.newegg.com/Product/Product.aspx?Item=N8...

http://www.newegg.com/Product/Product.aspx?Item=N8...

http://www.newegg.com/Product/Product.aspx?Item=N8...

http://www.newegg.com/Product/Product.aspx?Item=N8...

I don't really know what is considered a high end video card, but I have seen 500-800 dollars cards, isn't mine kind of low end?

also, the quad core doesn't really help since Crysis doesn't support quad, so you would get the same framerate with dualcore 3.0ghz right?

I'm just curious to know what games require $500 video cards...

I building a computer by myself for experience.

I built one before in school, but that's different

I don't really have a purpose for building this, I only want the experience,

I do some video, photo, and music editing

and play some games (Rainbow six vegas, AOE III, BF2, and swat 4)

are these specs ok?

is there anything I need to change?

thanks

http://img3.imageshack.us/my.php?image=28200911550...

(newegg)

driving your car you are moving at a speed of X m/s forward.You throw an ball sideways out the window at Y m/s relative to you. What is the velocity of the ball relative to the ground?

I used x and y because I don't want the answer

what I need clarified is

when I draw it out should it be a right triangle?

so the answer would just be the sqr of x^2+y^2 right?

thanks

Suppose we make a saline solution by dissolving 176g of salt in 5 L of water. The resulting total volume of the solution is very nearly 5.00L

a) calculate the concentration of the solution, explaining your reasoning briefly.

b) using the result obtained in part a, calculate how many cubic centimeters of solution must be taken in order to supply 10 g of salt. Explain

c) make up a problem which involves the density concept and in which the steps of reasoning are exactly parallel to the steps in a and b above. Be sure to select reasonable numerical values for the physical situation you describe. Present the solution of the problem, explain the steps briefly.

more interested in the steps than the answers...

thanks

does anyone know a site where there is a trig table that goes by 0.1 radians?

0.1

0.2

0.3....ect

thanks

1.The bay of Fundy is an inlet of the Atlantic Ocean bounded by Maine and New Brunswick on the north and Nova Scotia on the south. It is famous for its high tides. At a dock there, the depth of water is 2 ft at low tide and 58 ft at high tide, which occurs 6h12min after low tide. Draw a graph showing the depth of water at the dock as a function of the time since high tide occurs. Find an equation of your graph.

2. Rework he tide problem above assuming that the first high tide today occurs at 3:00am with a depth of 4.0m, and the first low tide occurs at 9:24am with a depth of 1.8m

3.Suppose that after you are loaded into a Ferris wheel car, the wheel begins turning at 4rpm. The wheel has diameter 12m and the bottom seat of the wheel is 1m above the ground. Express the height h of the seat above the ground as a function of time t seconds after it begins turning.

Please help, show all work, and explain, only reply if you know what you are doing

thanks

really need to understand this

HELP!

ok,

I want to buy a new computer, but I have not used Vista yet because I hate it, heard it has lot of problems.......ect

but

xp is going out the door (in 2011 I believe), and all new computers have Vista on it.

so

here are my main concerns:

1. will all of my programs and games work with Vista?

such as Halo 1, age of empires 3, warcraft 3.....ect. from what I know, I'm suppose to "update" my drivers for every single game/ program (hope I'm wrong :(

2. is there any BIG difference? If I'm used to xp, will Vista confuse me?

thanks

please reply ONLY if you have used it and know what you are talking about, even thought I don't own Vista yet, I not compelety stupid :)

PS: be nice :)

by the way, any "good" answer will get 3 points auto, (2 for answering, one for thumbs up) the best will get 13 total

is it possible to play USA ps2 games on a Taiwan PS2? I tried to but could not, any help?

1CO+3H2=1CH4+1H2O

1.list 5 ways we could make this reaction go faster. For each way, briefly tell why that change would make the reaction go faster; answers should be in terms of molecular collision theory.

2. what method of speeding a reaction would not work on this reaction and why?

I don't know and it will be on the test, please help

thanks

experiments were done with the reaction 2A+3B=D+3E.

the rate was measured for various concentrations of A and B, in order to find the order of the reaction. The order is the exponent in the rate constant; it varies with temperature and other factors such as the presence of a catalyst. It has whatever units are needed to make the equation work.

a. when the concentration, was doubled, the rate doubled. what is the order of the reaction in A? that is, what is the value of n in the equation above?

b. when the concentration of B, was tripled the rate increased to nine times what is was before. what is the order in B what is the value of m in the rate equation?

c. we would say that the reaction is____ order in A, ____order in B, or____order overall.

d. what would happen to the rate if we halved the concentration of A and doubled the concentration of B?

the rate would_______

for a, I got 1

for b, I got 2

c,d I don't know

please help

thank you

first order reactions have a constant half life. That is, there is a particular amount of time after which only one-half of the starting material will remain. After two half-lives, 1/4 remains (1/2times1/2), after three half-lives (3 x t1/2), 1/8=(1/2)^3 remains, and so on.

an experiment started with 64 g of reagent, which was consumed in a first-order reaction. After 90 minutes, only 2 g of the reagent was left.

a. what fraction of the starting material was left after 90 min?_____ This fraction is 1/2 raised to waht power?____How many half-lives does it take to reduce 64g to 2g?____

b. what was the half-life of the reaction?____

c. How much would be left after another 90 min?_____

thanks

PS: if you don't know, don't answer

also, I don't need work, but would like it to be explain so I can understand it.

thank you

You have posted content to Yahoo!7 Answers in violation of our Community Guidelines or Terms of Service. As a result, your content has been deleted. Community Guidelines help to keep Yahoo!7 Answers a safe and useful community, so we appreciate your consideration of its rules.

Deleted Question: another pathtic attempt at a joke?

Question Details: The dream of a Panda..... I wish someday I can take a color photo

2007-05-26 16:20:36Additional

sorry for those who thought it was not funny, it was to me when I read it in Chinese for those who don't get it, a panda is black and white, so it can't have a color pictures :) I did say it was "another pathtic attempt" so pathtic that I spelled pathetic wrong...sigh.....forgot a spell check

2007-05-26 18:57:23Additional