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I got a minor stuck here... please help me. Ok the stat problem is ... a mail order business has 9 phone lines and x is the number of line in use at a specified time. pmf of X is given: x 1 2 3 4 5 6 7 P(x) .1 .15 .2 .25 .2 .06 .04 Calculate the probability of certain events I...

SOme help with intergration by parts, please [b]1. Find: \int e^x cos (x) dx The Attempt at a Solution I tried using integration by parts - what we are working on... all these 3 possibilities: u = cos x, u= e^x, u = e^x cos(x) And the \int vdu are, respectively: 1. \int e^x sin(x)...

Hello all, how are you? we are currently working on integration by substitution, what do you guys think about the way i solved this one: Find: \int \frac{(t+1)^2}{t^2} dt My solution: \int \frac{(t+1)^2}{t^2} dt = \int 1dt + \int \frac{2}{t} dt + \int \frac{1}{t^2} dt = t +...

Daniel, yeah thanks for the code... i meant k\int_{0}^{3} e^{-0.25 x}{}dx =1 HallsofIvy, Uh... Thats the same word from the problem in the book... and yes, thats the integral from 0 to 3... I am not sure I know about the total integral... Sorry about the confusion.

Sorry, my LaTeX code looks bad.

Hello, Okay so I was given a density function: f(x) = 2e^(-0.25x) The problem asks for the value of Pr(X < or = 3) I first figured out the probability density function first by let \int (3,0) k.25e^(-.25x) = 1 And figured out that k = .45 and continue solving my...

"Around the corner" problem? Hey, I got this assignment from my class... it asks for the maximum length for a bar in order to get it through a corner created by 2 hallways... I am provided with the width of the 2 hallways and that's it. Can someone gimme a suggestion? Thanks Nam

Hey... I am kinda got stuck with this problem... can you guys give me a hint or something... Problem says: The tangentline to the curve y=1/3 x^3 - 4x^2 + 18x + 22 is parallel to the line 6x - 2y = 1 at 2 points on the curve... find the 2 points. Well I was thinking about writing the...

Oh hello This's just strange. We did a small project "Making ice-cream" You know, put milk and sugar and vanilla into a zimploc, place the pack into a bigger one stuffed with ice and salt. We've luckily gone through the questions he asked. But the last question just doesn't make sense to me...

I really don't know how to distinguish beween 2 things, it's based on the ratio right? Thanks

Well, I'm also a new one to genetics. I'm at Genetic linkage and crossover... I think I can understand the stuff.. but I can't find exercises to apply... What;s your idea? Thanks

Excuse me, I'm learning about the genetic interaction and I think I can get pretty much explanation in the Internet but Google didn't seem to be really helpful now. So please suggest me some sites on genetics and I'll try out! Thanks alot!

So why there're ppl who can let the electricity flow thru them while others can't?

Well, I've heard about some people who can let electricity flows through their bodies without any serious damage. Is there any sciebtific reason or theory for this? Is that the resistance f them 0 or nearly so? What do you think?

Please be patient, I'm sure somebody will help you. :)

Okay, thanks Dextercioby. Viet dao, you meant that I compute incorrectly? Hmmm let me do it again. Or, we can 'break out' the absolute by divide into two situation: x-1 >= 0 or x-1 <0 it's long, but not so confusing.

Why? So, is my solution wrong? Thanks

Hello, Well, I have the equation: x^2-2x-m|x-1|+m^2=0 (1) They ask me what m is so that the equation has solution(s) Well, I let t=|1+x| and solve the problem with t (no more x) and I have the last equation: t^2-mt+m^2-1=0 (2) in order that (1) has solution(s), (2) must have solution(s) t...

Ah, by the way, We have: If \Delta =0, the subtance is not 'full' so; it has no \pi_{cc} linkage, no 'cycle. If \Delta =1, the subtance has 1 \pi_{cc} linkage OR 1 'cycle' If \Delta =2, the subtace has 2 \pi_{cc} linkages OR 1 \pi_{cc} linkage + 1 'cycle' OR 2 'cycles' So, what is this...

Well, hello! I was informed a new formula. As a non-native, I can't give out the definitons, I hope that you can help me call some. Well, here is the formula: \Delta=\frac{2+\Sigma n_i (V_i-2)}{2} Well, as far as I can say, \Delta here is equal to the total of the linkage C=C+ number of...

Well, okay, Thanks! Thanks for all of your time and help!

Excuse me, still, I don't know what for? Please explain for me. Thanks! btw, if we figure the another way, as thru R3 and R4, is it the same? Thanks

Oh thanks, I got it, it's U_{MN}=4V Thanks alot!

Ohh, sorry, I'm so clumsy, I didn't mean to draw a straight line connecting M and N, there was nothing connecting them at all. yes, they meant to cross the resistances. And that's helped. Thanks! BTW, I got difficulty when I need to go down for the next line, what's the syntax in LaTex for...

Well, I'm quite idle in Lunar New year's holidays so I decide to do some exercises on Physics, I got stuck when solving the problem, then I tried with the suggestion on my textbook, but still, I don't understand the problem, please help me out! btw, sorry, something has gotten on LaTex or I'm...

Hmm... yeah, the basic consequence \lim_{x\rightarrow0}\frac{ln(1+u)}{u}=1

Uhmm... alright! Just imagine that sinx = \alpha Then the thing above is equal to: \lim_{x\rightarrow0}\frac{ln(1+\alpha)}{\alpha} (*) Then, this limit is a consequence limit of e: \lim_{x\rightarrow\infty}(1+\frac{1}{x})^x = e So. (*) =1

Hmmm... So far, I've done it. But I think tis way is better: \lim_{x\rightarrow0} \frac{ln(1+sinx)}{x} =\lim_{x\rightarrow0} \frac{ln(1+sinx)}{sinx} . \frac{sinx}{x} =1.1 = 1 Is it right?

Okay, thanks! PS: Thanks for telling me about LaTex! It's cool! I'm learning it!

Well, I got it as lim (x->0) of [(1+sinx)^(1/x)]

Why e^{L}=\lim_{x\rightarrow 0}(1+\sin x)^{\frac{1}{x}} ?

Sorry, misters, but I got stuck while finding the lim of e^y.

Ok, I got it! I was so stupid! Thanks, Mr. Hallsofivy, thanks Mr. Dextercoby

No I haven't learned about it yet. Any other way?

Well, hello! I have difficuties solving a problem. Well, the first 3 ones are done successfully: a. Calculate out the lim (x -> inf) of (1+2/x)^x But assuming that 2/x = 2/t, I got the result to be e^2 b. Do the same thing with the lim (x ->0) of (1+3x)^(1/x) Well, yeah "do the same...