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Word Problem And Equation December 4th 2007, 06:08 AM #1 Junior Member Joined Jun 2006 Posts 25 Word Problem And Equation I have two problems right now the 1st is an equation 1, Two people walk 240 meters at a constant speed Person A takes 100 more steps than the other, Person B's steps are ...
4
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Power series, term-by-term integration April 7th 2010, 03:44 PM kingwinner Power series, term-by-term integration Evaluate ∞ ∑ 1 / [n(n+1) $5^n$] n=1 (hint: start with a geometric series, then use term-by-term integration) =================================== Attempt: ∞ ∑ $x^n$ = ...
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8sin^2(v)-2cos(v)=5 August 29th 2006, 03:52 AM #1 Junior Member Joined Oct 2005 Posts 54 8sin^2(v)-2cos(v)=5 $8\sin(v)^2-2\cos(v)=5 \Leftrightarrow$ $8(1-\cos(v)^2)-2\cos(v)=5 \Leftrightarrow$ $8-8\cos(v)^2-2\cos(v)=5 \Leftrightarrow$ $1-\cos(v)^2-\frac{1}{4}\cos(v)=\frac{5}{8} \Leftrightarro...
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On Dimension Extension of a Class of Iterative Equations Abstract and Applied Analysis Volume 2013 (2013), Article ID 180184, 7 pages http://dx.doi.org/10.1155/2013/180184 Research Article On Dimension Extension of a Class of Iterative Equations College of Mathematics and Computer Science, Hunan Normal University, C...
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Homework Help Posted by Katie A on Friday, September 30, 2011 at 11:56pm. how do I solve using the multiplacation method -2x>1/9 • math - Steve, Saturday, October 1, 2011 at 6:08am I guess that means that you multiply both sides by the reciprocal of the coefficient thusly: -2x * 1/-2 < 1/9 * 1/-2 x ...
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[SOLVED] Quick Communication Vector Question February 16th 2009, 06:51 AM #1 Junior Member Joined Feb 2009 Posts 27 [SOLVED] Quick Communication Vector Question a) If u and v are non-zero vectors, but Proj(u onto v) = 0, what conclusion can be drawn? b) If Proj(u onto v) = 0, does it follow that Proj...
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MGF Help Please May 6th 2010, 10:33 PM #1 Newbie Joined May 2010 Posts 6 MGF Help Please Suppose X ~ N(0,1), i.e. X is normally distributed with mean 0 and variance 1. Let Y = X^2 Find the MGF of Y DIRECTLY... Can't seem to get a good answer out. Any help would be appreciated. Also...
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Find all pairs of positive integers a and b such that... July 5th 2005, 04:33 AM #1 Junior Member Joined May 2005 Posts 33 Find all pairs of positive integers a and b such that... Once again I am stuck on a question. Thanks as always. Find all pairs of positive integers a and b such that... a^2...
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Prove a cubed inverse matrix is the same as an inverse cubed matrix March 1st 2010, 03:02 AM #1 Newbie Joined Oct 2009 Posts 9 Prove a cubed inverse matrix is the same as an inverse cubed matrix I have been asked to prove that the for a generic matrix A that, $(A^3)^{-1}$ is the same as $(A^{-1})^3$. I h...
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This integral is doing my head in! April 6th 2010, 05:40 PM #1 Newbie Joined Sep 2009 Posts 5 This integral is doing my head in! I am trying to do the integral $<br /> \displaystyle\int^\pi_0 F(\theta)\,d\theta<br />$ ...where $<br /> F(\theta) = \frac{\epsilon(1-cos\theta)}{1+\epsilon(1-c...
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General Solutions of Two Quadratic Functional Equations of Pexider Type on Orthogonal Vectors Abstract and Applied Analysis Volume 2012 (2012), Article ID 675810, 10 pages http://dx.doi.org/10.1155/2012/675810 Research Article General Solutions of Two Quadratic Functional Equations of Pexider Type on Orthogonal Vecto...
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Rates of change March 7th 2009, 04:06 AM Orangeobe Rates of change I'm having trouble fully understanding the following question. Can anyone help please? p = e^(β0 + β1x) where β0 = 10.17 and β1 = -0.01581 dp/dx = β1e^(β0 + β1x) The Question A small change in mileage (x) will lead to a smal...
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equations planes 1. June 26th 2007, 09:00 AM #1 2. June 27th 2007, 10:55 PM #2 Hello, maybe this comes a little bit late ... If $\vec{x}=\left(\begin{array}{c}x \\ y \\z \end{array} \right)$ then the equations of the lines can be written like this: $L:\vec{x} = \underbrace{\vec{a}}_{\text...
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Math Help September 25th 2006, 09:27 PM #1 Junior Member Joined Feb 2006 From Victoria, Australia Posts 36 Series ok i really hate series, they are confusing and i almost have no idea how to do them. These questions are really driving me up the wall. Any help would be greatly appreciated. ...
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The Maximum Segment Sum Problem: Its Origin, and a Derivation In a previous paper of mine, regrettably, I wrongly attributed the origin of the maximum segment sum problem to Dijkstra and Feijen’s Een methode van programmeren. In fact, the story behind the problem was told very well in Jon Bentley’s Programming Pearls....
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differentiation I need help with the following derivatives y= (e^1/x) / x^2 f(t) = t ln(5t) thanks for your help Could you show us what exactly is giving you trouble? What do you get when you attempt them? Using the rules you suggested i got dy/dx = ((x^2)(e^1/x) - (e^1/x)(2x)) / x^4 f ' (t) = (1/5t) (t) are they cor...
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Homework Help Posted by Jake on Sunday, April 8, 2012 at 3:34am. Which plane goes through the origin and is perpendicular to the line r=(2,-2,1) + s(2,3,-4), seR? a) 2x-2y+z=0 b) 2x+3y-4z=0 c) 2x+3y+z-4=0 d) none of the above. I got D, none of the above. I have substituted and couldn't find the answer equal to ze...
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Kernal and Range December 20th 2012, 02:02 AM #1 Junior Member Joined Nov 2012 From United States Posts 25 HI I am studying for the final which is in less then 7 hours, There is this one question on the review sheet which I really can't do at all, for some reason I just think I can't do Kernal and ...
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Prove that both rings are fields but that they are not isomorphic. March 29th 2011, 02:01 PM #1 Junior Member Joined Sep 2010 Posts 42 Prove that both rings are fields but that they are not isomorphic. Let $\mathbb{Q}[\sqrt{n}] = \{a + b\sqrt{n}\}$ Prove that both $\mathbb{Q}[\sqrt{2}]$ and $\mathbb{...
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Nordrassil Raiment and Regrowth Don’t hate me because I represent only a minor efficiency increase to an already marginalized spell. Because apparently some of you care if the math I present is accurate, I’ve been forced to delve a little deeper into the effects of the Nordrassil Raiment on the efficiency of R...
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12 Cards are delath from 52 playing cards November 13th 2009, 07:09 AM desire150 12 Cards are delath from 52 playing cards Suppose that a hand of 12 cards is dealt from a normal deck of 52 playing cards. What is the probability that of the 12 cards, 3 will be diamonds, 3 will be clubs, 3 will be spades, and 3 wi...
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Intergration using trig substitution November 14th 2010, 05:37 PM #1 Member Joined Oct 2007 Posts 159 Intergration using trig substitution I need to integrate 1/ (1 - x^2)^(1/2) dx I know I can use x = sin theta but... I was also taught that I can use x = cos theta When I do this I end up with ...
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Homework Help Posted by how to do this? on Monday, January 30, 2012 at 1:11pm. a pendulum with a length of .600 m has a period of 1.55 s. what is acceleration due to gravity at the pendulums location • physics - Damon, Monday, January 30, 2012 at 4:24pm potential energy = m g h = m g L (1-cosA) if angle A...
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Help Géo !!! February 4th 2010, 09:06 AM #1 Junior Member Joined Dec 2009 Posts 46 Help Géo !!! Hii ! I need Help For This Exercice : Either $ABC$ a triangle and $D$ point belonging to $[BC]$ such as : $\widehat{DAC} = 90$ , $\widehat{BAD} = 30$ , $BD=AC=1$ . Find / Calculate $CD$ . ...
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Double-Angle Formulas November 2nd 2009, 01:49 PM #1 Member Joined Sep 2009 Posts 181 Double-Angle Formulas Hello, Can someone please help me with these problems? Find Sin2x, Cos 2x, and Tan2x for: 1. tan x= -4/3 quadrant II 2. csc x = 4, tan x<0 how do I start the problem? f...
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Synchronization of Neural Networks with Mixed Time Delays under Information Constraints Abstract and Applied Analysis Volume 2013 (2013), Article ID 510903, 7 pages http://dx.doi.org/10.1155/2013/510903 Research Article Synchronization of Neural Networks with Mixed Time Delays under Information Constraints ^1School ...
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the encyclopedic entry of integer The integers (from the Latin integer, literally "untouched", hence "whole": the word entire comes from the same origin, but via French) are the set of numbers consisting of the natural numbers including 0 (0, 1, 2, 3, ...) and their negatives (0, −1, −2, −3, ...). They are numbers that...
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definitions March 21st 2010, 04:22 AM alexandrabel90 definitions what is the difference between the joint probability density function and the joint distribution function when they are both denoted as F(x,y)? March 21st 2010, 11:02 AM CaptainBlack Quote: The joint density is normally a lower case fu...
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Subnormal Weighted Shifts on Directed Trees and Composition Operators in Abstract and Applied Analysis Volume 2014 (2014), Article ID 791817, 6 pages http://dx.doi.org/10.1155/2014/791817 Research Article Subnormal Weighted Shifts on Directed Trees and Composition Operators in ^2-Spaces with Nondensely Defined Power...
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Homework Help Posted by Danny on Sunday, May 11, 2008 at 10:14am. Suppose you conduct a study and find that the probability of having a baby boy is 60%. Now suppose three of your relatives are going to have babies. a) Build a tree diagram showing all the conditional probabilities and joint probabilities associated wi...
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Formula for Arithmetic sequence September 27th 2009, 07:23 PM #1 Junior Member Joined Sep 2009 Posts 61 Formula for Arithmetic sequence find the formula for an for the arithmetic sequence. a3=94, a6=85 ok i know how to solve a similar problem when i am given a1 and d. but i dont have either A...
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Homework Help Posted by sh on Wednesday, March 24, 2010 at 12:24am. Find an equation of the tangent line to the given curve at the given point y=(1/cosx)-2cosx at((pi/3),1) y'=0+2sinx slope = √3 y=mx+b 1=(√3)(pi/3)+b b=(3-√3pi)/3 3√3x-3y+3-√3pi=0 What did I do wrong? Thanks in advance. • Calculus - sh, Wedn...
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Signless Laplacian Polynomial and Characteristic Polynomial of a Graph Journal of Discrete Mathematics Volume 2013 (2013), Article ID 105624, 4 pages http://dx.doi.org/10.1155/2013/105624 Research Article Signless Laplacian Polynomial and Characteristic Polynomial of a Graph ^1Department of Mathematics, Gogte Instit...
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Finding the order of a group element November 10th 2009, 08:49 PM #1 Newbie Joined Nov 2009 Posts 1 Finding the order of a group element I'm stuck on the following problem: if a and b are in a group G, and a^5=e and b^2=a*b*a^-1, what is the order of b (assuming b is not e). Any ideas where to start? I'v...
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Dense matrices over the integer ring sage: m = matrix([(-2, 1, 9, 2, -8, 1, -3, -1, -4, -1), ... (5, -2, 0, 1, 0, 4, -1, 1, -2, 0), ... (-11, 3, 1, 0, -3, -2, -1, -11, 2, -2), ... (-1, 1, -1, -2, 1, -1, -1, -1, -1, 7), ... (-2, -1, -1, 1, 1, -2, 1, 0, 2, -4)]).sta...
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[SOLVED] Limits March 26th 2009, 06:43 PM nzmathman [SOLVED] Limits Have come across a limits questions I am having trouble with. (1) $\lim_{x\to \pi}~\frac{\pi-x}{\sin{x}}$ $= \lim_{x\to \pi}~\left(\frac{\pi}{\sin{x}} - \frac{x}{\sin{x}}\right)$ I get stuck after that...I know that $\lim_{x\to 0}...
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what is the probability of drawing two red marbles... December 11th 2011, 07:28 AM slapmaxwell1 what is the probability of drawing two red marbles... im not sure why probability problems give me fits.... ok so here is the problem. a bag contains 3 red marbles and 3 blue marbles. what is the probability...
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partial differentiation January 17th 2013, 07:49 AM JacobOCD partial differentiation Hello I have two functions: $V(x,h)=x^2 \cdot h=4$ and $A(x,h)=2x^2+4xh$ As someone might guess, this is a optimization problem of sorts (minimization of A(x,h) with V(x,h)=4 as constraint). My problem a...
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Homework Help physics - tchrwill, Wednesday, October 12, 2011 at 10:51am Excuse the change in units. 60 year old habits are hard to break. You left us without a clue as to the weight of the rocket. Propellant fractions of rockets typically range from .85 to .90, i.e., the weight of propellant divided by the fully loa...
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Inequality October 7th 2007, 01:20 PM #1 Junior Member Joined Aug 2007 Posts 32 Inequality is it true that $||z| - |w|| \leq |z + w|$?? if so what is the proof? here is my workin so far.. please verify it We know $|z+w| \leq |z|+|w|$ let c = z - w, so $|c+w| \leq |c|+|w|$ Now...
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Trig Identities Prove that 1-sin^2X/1+cotX - cos^2X/1+tanX = sinXcosX Much thanks in advance. Yes, I understand, but .. in the original equation, there are no parantheses. I typed the question exactly as it is shown on the paper given to me. Hello, ahling! Prove that: . $1 - \frac{\sin^2\!x}{1 + \cot x}- \frac{\cos^2...
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Equations on the set of complex numbers October 31st 2010, 10:44 AM #1 Newbie Joined Oct 2010 Posts 6 Equations on the set of complex numbers Hello, Can someone help, how to solve x ^ 3 = 1 and/or x ^ 4 = -4 equations on the set of complex numbers? Thanks in advance! I'll do...
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Help with logs please May 14th 2005, 01:36 PM jamesh Help with logs please We just started doing some work on logs and i cant work out this problem, i think its quite easy but im crap at these. Two curves: y=a^x and y=2b^x Prove that x coord of the point of intersection is 1 / (log(of base2)A-log(...
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Another modular arithmetic proof December 11th 2012, 08:00 AM dom139 Another modular arithmetic proof "By considering all possible residue classes modulo 6, or otherwise, prove that n^3 - n is a multiple of 6 for all integers n." I've been staring at this one for a while now and i've got tunnel vision. T...
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ODE Integral by partial fractions April 22nd 2013, 07:06 PM mathlover10 ODE Integral by partial fractions the solution technique is easy but I'm exhausted and having surgery...by the way what is the partial fraction expansion for this differential equation? $\LARGE \frac{dy}{dt}+\frac{ty}{1+t^2}=1-\ frac{t^3...
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Money Problem January 17th 2013, 03:52 PM #1 Money Problem Jack's parents have been paying $450 per month into a retirement fund for the last 30 years. The fund is now worth $450 000. What annual interest rate, compounded monthly are Jack's parents earning? Round to two decimal places. Please any one, ho...
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Lessons In Electric Circuits -- Volume I Lessons In Electric Circuits -- Volume I Chapter 16 RC AND L/R TIME CONSTANTS This chapter explores the response of capacitors and inductors to sudden changes in DC voltage (called a transient voltage), when wired in series with a resistor. Unlike resistors, which respon...
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I need to minimize the surface area of this cylinder November 23rd 2008, 02:15 PM la_lo626 I need to minimize the surface area of this cylinder design a cylinder which can hold a volume of 10ft cubed. so that it's used with minimal material. what are the dimensions (r and h) and what is the relationship between ...
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[SOLVED] Initial height question in vector spaces February 1st 2010, 07:10 AM #1 Newbie Joined Feb 2010 Posts 2 [SOLVED] Initial height question in vector spaces A stone is thrown from a rooftop at time t = 0. Its position at time t is given by r(t) = (10t,−5t, 6.4−4.9t^2). The origin is at the base of t...
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How to simplify velocity magnitude equations? September 29th 2009, 09:29 AM #1 Junior Member Joined Oct 2008 Posts 32 How to simplify velocity magnitude equations? In my calculus class a few days ago, my professor was going over how to find three dimensional velocity and its magnitude. In the problem, th...
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Homework Help Posted by RAUNAK on Saturday, February 15, 2014 at 1:26am. AN AP has 21 term the sum of 10 ,11,12 term is 129 and sum of last 3 term is 237.find AP • MATH - Steve, Saturday, February 15, 2014 at 6:32am T10+T11+T12 = (a+9d)+(a+10d)+(a+11d), so 3a+30d = 129 Similarly, for the last three ter...
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Every nonzero vector space can be viewed as a space of functions July 22nd 2010, 01:31 PM buri Every nonzero vector space can be viewed as a space of functions The problem statement, all variables and given/known data Let V be a nonzero vector space over a field F, and suppose that S is a bases for V. Let C...
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Help with simple equation needed. October 25th 2010, 07:18 AM #1 Newbie Joined Jul 2010 Posts 2 Help with simple equation needed. Hi, I cannot solve the following equation to x. $27^{\sqrt{2-3x}} = 243^{\sqrt{3x-2}}$ I tried it like this: $\sqrt{2-3x}lg(27) = \sqrt{3x-2}lg(243)$ ...
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integral test convergence divergence July 29th 2009, 03:32 PM #1 Junior Member Joined Jul 2009 Posts 42 integral test convergence divergence im confused on this one $\sum_{n = 2}^{\infty} 6n^2 \exp(-n^3)$ i think the exponential goes to 0 does this mean that i can not use the integral test? ...
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Volumetric expansion problem August 7th 2011, 10:06 AM #1 Newbie Joined Aug 2011 Posts 1 Volumetric expansion problem Hello, i understand this isnt a calculus question but there seems to be the most people on this forum. Im studying for my Power Engineer 3rd class and have a question. At 5 degrees celciu...
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Trig Identity Problems November 28th 2008, 08:51 PM Chouman Trig Identity Problems Got two problems for extra credit that I can't seem to figure out if anyone here can. Prove the following. 1. cosx-(sinx-1)/cosx+(sinx-1) = sinx/1-cosx It says as a hint to multiply the numerator and denominator ...
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Combination Mode of Internal Waves Generated by Surface Wave Propagating over Two Muddy Sea Beds Advances in Mathematical Physics Volume 2012 (2012), Article ID 183503, 9 pages http://dx.doi.org/10.1155/2012/183503 Research Article Combination Mode of Internal Waves Generated by Surface Wave Propagating over Two Mudd...
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An Efficient Pseudospectral Method for Solving a Class of Nonlinear Optimal Control Problems Abstract and Applied Analysis Volume 2013 (2013), Article ID 357931, 7 pages http://dx.doi.org/10.1155/2013/357931 Research Article An Efficient Pseudospectral Method for Solving a Class of Nonlinear Optimal Control Problems ...
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Solving Polynomial Inequalities Solving Polynomial Inequalities (page 1 of 2) The first step in solving a polynomial inequality is to find the polynomial's zeroes (its x-intercepts). Between any two consecutive zeroes, the polynomial will be either positive or negative. Since the inequality is asking for positivity ("...
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Simultaneous Equations January 25th 2009, 09:53 AM #1 Newbie Joined Oct 2008 Posts 5 Simultaneous Equations Hey guys, I have these two questions, which I am confused about. If anyone could help me I would be very grateful! "Solve the following simultaenous equations using an analytical method (eithe...
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Max Profit April 5th 2009, 05:57 PM sk8erboyla2004 Max Profit This problem makes no sense to me A store can sell 20 bikes per week at $400. For each $10 the store lowers the price by 2 more bicycles sold per week. each buke costs the store 200 dollars what price should be charged to maximize profit? how...
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Verifying the divergence theorem July 30th 2009, 12:51 PM #1 Verifying the divergence theorem I must verify the divergence theorem in the following case : $F(x,y,z)=x \vec i + y \vec j + z \vec k$. And $S$ is the surface of the sphere $x^2+y^2+z^2=4$. My attempt : $\iint _S F \bold n dS=\iiint _S div ...
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A rectangular photograph is surrounded by a border that is 1 Question Stats: 82%18% (03:02)based on 99 sessions D. First, we know that M is the area of the picture AND the border, and that the border is 1 in wide. If you have a border around a picture that is 1" wide, it doesn't add just 1" to the width and height, ...
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If |12x−5|>|7−6x|, which of the following CANNOT be the Author Message TAGS: If |12x−5|>|7−6x|, which of the following CANNOT be the [#permalink] 11 Jun 2013, 03:17 ...
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Homework Help Posted by jenny on Thursday, August 25, 2011 at 12:46am. Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the symmetry of the graphs of sin, cos and tan, to find the exact values of sin -pi/6, cos 5/3pi and tan 4pi/3. I have found the answers to the first three using the special table...
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Solve The Following Trigonometric Integral. (3) January 18th 2010, 08:14 AM #1 Member Joined Jan 2009 Posts 236 Solve The Following Trigonometric Integral. (3) Hello here is it: $\int ( cos(x) + 1 )^{\frac{3}{2}} dx$ I used $u=cos(x)+1$ Then, I got : $- \int \frac{u^{\frac{3}{2}} }{ \...
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real numbers July 18th 2008, 10:52 AM perash real numbers a, b, c, d, e are real numbers such that a + b + c + d + e = 8 a^2 + b^2 + c^2 + d^2 + e^2 = 16. What is the largest possible value of e? July 19th 2008, 12:18 AM JaneBennet Let’s suppose $a$, $b$, $c$, $d$ are non-negative. (Obviou...
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More trig review November 9th 2008, 07:35 PM #1 More trig review Ok I'm having problems with these 3 problems Solve each equation in the interval {0,2pi) and round your answer to the nearest hundredth of a radian A) $3\sin^{x} - \sin{x} - 1 =0$ B) $2\sin{x} - 3\cos{x} = 1$ C) $3\sin{x} - 5 = 0...
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Multiple Active Contours Guided by Differential Evolution for Medical Image Segmentation Computational and Mathematical Methods in Medicine Volume 2013 (2013), Article ID 190304, 14 pages http://dx.doi.org/10.1155/2013/190304 Research Article Multiple Active Contours Guided by Differential Evolution for Medical Imag...
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A Survey of Binary Search If you think you know everything you need to know about binary search, but have not read Netty van Gasteren and Wim Feijen’s note The Binary Search Revisited, you should. In the FLOLAC summer school this year we plan to teach the students some basics of Hoare logic and Dijkstra’s weakest pre...
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The class equation of G is 60=1+15+20+12+12. Then G is simple. April 20th 2012, 06:54 AM #1 Member Joined Feb 2009 Posts 138 The class equation of G is 60=1+15+20+12+12. Then G is simple. I think I found a proof but not sure. Let A_i denote the classes. Class Number of elements in the class ====...
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Math Help August 17th 2012, 11:46 AM #1 Newbie Joined Aug 2012 From Canada Posts 21 Isomorphism Hey There I need to show that 2 groups with order 3 is isomorphic I basically have the answer I just wanted to double check with you guys I have proven that ab=identity and that simularly cd=i...
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Tiling array data analysis: a multiscale approach using wavelets • We are sorry, but NCBI web applications do not support your browser and may not function properly. More information • BMC Bioinformatics. 2011; 12: 57. Tiling array data analysis: a multiscale approach using wavelets Abstract Background T...
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Computational & Applied Mathematics Services on Demand Article Indicators Related links Share On-line version ISSN 1807-0302 Comput. Appl. Math. vol.28 no.2 São Carlos  2009 http://dx.doi.org/10.1590/S1807-03022009000200003  A filter SQP algorithm without a feasibility restoration phase^* Chungen Shen^I,II; We...
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What am I doing wrong, differential equation May 2nd 2008, 02:21 PM arbolis What am I doing wrong, differential equation We're looking for $x(t)$. The data are : $x'=f(t,x)$, $x(0)=0$. We have $f(t,x)=1+x^2$. I rewrite it as $\frac{dx}{dt}=1+x^2$. Which is equivalent to $1=\frac{dx}{(1+x^2)dt}$. Equivale...
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Homework Help Posted by laura on Thursday, March 29, 2007 at 11:22pm. Find the two consecutive odd integers such that 5 times the first integer is 12 more than 3 times the second. can some explain to me how to get this i was thinking the formula would be ' 5x+12=3x No, that's not it. The second integer is x+2, sin...
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Negation Logic January 11th 2009, 01:49 PM #1 Negation Logic Write the negation of the logical expression $(p \rightarrow eg q) \wedge (p \vee q)$. Simplify it to the point where the negation symbol appears only in front of the variables $p$ and $q$, do not leave the negation symbol in front of a parenthetica...
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Help with L'Hospital's Rule question November 25th 2009, 05:20 PM #1 Junior Member Joined Sep 2009 Posts 32 Help with L'Hospital's Rule question Hey guys, I was just wondering if you could help me out with a question. I think I've wittled it down enough but I'm having troubles simplifying it and I'm...
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f(x+y)=f(x)*f(y), f(1)=q. find the followings. November 14th 2012, 07:11 AM #1 Newbie Joined Apr 2010 Posts 7 f(x+y)=f(x)*f(y), f(1)=q. find the followings. There are 5 questions on this problem. The one I have difficult with is the last one, I think I got the first four. Given a function f(x+y)=f(x)...
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Compute E[X(X-1)] December 14th 2009, 01:39 AM #1 Banned Joined Dec 2008 From Mauritius Posts 523 Compute E[X(X-1)] Question : A Binomial variate $X$ has the mean $6$ and standard deviation $\sqrt{2}$. Find its moment generating function. Hence obtain $E[e^{2X+3}]$. Also compute $E[X(X-1)]$ Firs...
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the encyclopedic entry of symmetrize In group theory , a word metric on a group $G$ is a way to measure distance between any two elements of $G$ . As the name suggests, the word metric is a metric on $G$ , assigning to any two elements $g$ , $h$ of $G$ a distance $d\left(g,h\right)$ that measures ho...
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Equation of the tangent line at that point February 12th 2011, 04:44 PM agent2421 Equation of the tangent line at that point Can someone please explain to me how to do this. It seems like a very straight forward question. Find the slope of the tangent line to the graph of each function at the given point. W...
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Check derivtives for correctness January 16th 2011, 11:58 AM sedemihcra Check derivtives for correctness I have not done differential calculus for awhile. I reviewed my calc book, but I am still having some trouble. Could someone please check these derivatives? $f(x) = e^x + 2^-^x + 2*cos(x)-6$ $f'(x) =...
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Coordinates where tangent line is vertical? October 5th 2008, 05:33 PM #1 Newbie Joined Sep 2008 Posts 23 Hey anyone know how I can solve this? The equation is (x^2)+2x+(y^4)+4y=5 How do I find the coordinates of the two points on the curve where the line tangent to the curve is vertical? A...
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Math Help April 18th 2010, 06:28 PM #1 Junior Member Joined Oct 2009 Posts 56 divisor If p(x) is a polynomial of degree n in F[x] and if E is the splitting field of p(x) over F, then (E:F) is a divisor of n! If the polynomial p(x) is separable or characteristic of F is 0, then it can be shown direc...
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Physics Urgent please help Posted by Ramana on Wednesday, November 13, 2013 at 11:05am. A physical pendulum consists of a body of mass contained in the xy-plane. The moment of inertia of the object about an axis perpendicular to the plane and passing through the object's center of mass is I_cm . The object oscillates...
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Question about inner product space inequality November 24th 2009, 04:06 PM #1 Newbie Joined Nov 2009 Posts 1 Question about inner product space inequality Hi guys, How would I show that $\sum\limits_{j = 1}^n {\left| {\left\langle {x,{v_j}} \right\rangle \left\langle {y,{v_j}} \right\rangle } \right...
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Numerical Solution of Singular Lane-Emden Equation ISRN Mathematical Physics Volume 2013 (2013), Article ID 507145, 9 pages http://dx.doi.org/10.1155/2013/507145 Research Article Numerical Solution of Singular Lane-Emden Equation Department of Applied Mathematics, School of Mathematical Sciences, University of Guila...
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An Inventory Model with Time-Dependent Demand and Limited Storage Facility under Inflation Advances in Operations Research Volume 2012 (2012), Article ID 321471, 17 pages http://dx.doi.org/10.1155/2012/321471 Research Article An Inventory Model with Time-Dependent Demand and Limited Storage Facility under Inflation ...
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exponential function March 12th 2008, 05:40 AM mt_lapin exponential function A person invests $7000 at 10% interest compounded annually. Let $f(t)$ be the value (in dollars) of the account at t years after he/she has deposited the $7000. a. Find an equation of f. My answer: $f(t)=7000(1.10)^t$ b. ...
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Find the area of the finite region May 6th 2008, 09:07 PM #1 Member Joined Sep 2007 Posts 198 Find the area of the finite region Find the area of the finite region bounded by the curve with equation x^2 - y^2 = 4 and the line x = 5. So to find the region we've to find, int (x^2 - 4)^1/2 dx with limi...
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integral of exp(-x^2) $e^{-x^2}$ does not have an elementry antiderivative. The integral can be calulated using Taylor series. $e^{-x^2}=\sum_{n=0}^{\infty}\frac{(-1)^nx^{2n}}{n!}$ So we can integrate this term by term to get $\int_{0}^{1}\sum_{n=0}^{\infty}\frac{(-1)^nx^{2n}}{n!} dx = \sum_{n=0}^{\infty}\frac{(-1)^n}{...
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1. Introduction     With rapid progress of the information age, information itself as well as physical objects has become a major part of economic value and current popularity of information technology (IT) intensifies the importance of information. For example, in the manufacturing industries, products are mostly re...
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Math Question Help October 6th 2009, 06:41 PM #1 Member Joined Oct 2009 Posts 123 Math Question Help Solve for x, ER -x^3+25x < 0 ---- I tried it out and i got: x = 0, -5, 5 therefore if x is less than 5, x < 0 if x is greater than 5, x <0 not sure if it's right though. ...
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Quasilinearization for the Boundary Value Problem of Second-Order Singular Differential System Abstract and Applied Analysis Volume 2013 (2013), Article ID 308413, 7 pages http://dx.doi.org/10.1155/2013/308413 Research Article Quasilinearization for the Boundary Value Problem of Second-Order Singular Differential Sys...
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A Simple Power Management Scheme with Enhanced Stability for a Solar PV/Wind/Fuel Cell/Grid Fed Hybrid Power Supply Designed for Industrial Loads Journal of Electrical and Computer Engineering Volume 2014 (2014), Article ID 319017, 18 pages http://dx.doi.org/10.1155/2014/319017 Research Article A Simple Power Managem...
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Andy's Math/CS page Fun with Censorship: the Finite Case This post was inspired by Elad Verbin's insights and question about the 'Damn Good Puzzle'.  See that post's comments section for the buildup. Here is a finite version of the censor puzzle (which readers should review for the scenario): Given k > 0, there is...
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[ -0.046142578125, -0.00714111328125, -0.06396484375, -0.06396484375, 0.015869140625, 0.0859375, 0.032958984375, -0.0625, 0.0233154296875, 0.05615234375, -0.0223388671875, 0.044677734375, 0.1103515625, -0.0228271484375, -0.07275390625, 0.0162353515625, 0.06103515625, -0.0225830078125...
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4096 has 13 factors WHY August 31st 2008, 07:45 PM #1 Newbie Joined Feb 2008 Posts 21 4096 has 13 factors WHY Why is 4096 the smallest number with 13 factors. What does 2^n have to do with it? I understand in order to get an odd number of factors you have to use a perfect square. Thanks for anythin...
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[ 0.02587890625, -0.031982421875, -0.02734375, 0.03466796875, 0.06689453125, 0.056396484375, 0.00335693359375, 0.099609375, 0.010986328125, 0.044189453125, 0.0003223419189453125, 0.032958984375, 0.0172119140625, 0.05029296875, 0.0252685546875, 0.05126953125, -0.1103515625, -0.0451660...
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Finding exact area with the Definite Integral November 14th 2007, 11:18 PM #1 Finding exact area with the Definite Integral Okay i was busy trying to figure these things out and then i got stuck. Now using the Riemann notation to calculate the area under the graph $x^2 + 1$ we get the following: $R_{6} ...
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[ -0.036865234375, -0.031005859375, -0.00872802734375, -0.05810546875, -0.005126953125, -0.052001953125, -0.038330078125, 0.055419921875, 0.01904296875, -0.018310546875, -0.0517578125, -0.025634765625, -0.0126953125, -0.007537841796875, -0.031982421875, -0.0306396484375, -0.06030273437...
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[SOLVED] Checking my result (infinite series) July 12th 2008, 08:59 AM #1 [SOLVED] Checking my result (infinite series) Just want to be sure about my results. Say whether it converges or not : 1) $1-\frac{1}{2}+\frac{2}{3}-\frac{1}{3}+\frac{2}{4}-\frac{1}{4}+\frac{2}{5}-\frac{1}{5}+...$. I wrote it as $\s...
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[ -0.0732421875, -0.06689453125, 0.05908203125, 0.0036163330078125, 0.0206298828125, -0.05322265625, -0.01544189453125, 0.0771484375, 0.0030059814453125, 0.03125, -0.08984375, -0.06298828125, -0.01092529296875, 0.0081787109375, -0.1025390625, -0.07763671875, 0.068359375, -0.1328125, ...
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