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Proof of n-cube March 31st 2009, 09:20 PM smellatron Proof of n-cube Write down a proof that the n-cube cannot be realized as a planar graph for any n >=4. I know I want to use the inequality of kF<=2E and F=E-V+2 but I am not sure how to find the values. A 4 cube has 16 nodes, and k = 3, so there a...
4
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Height of cone pls teach me how to start amd solve part (A). thank you very much $OQ$ is the slant height of the cone. The formula for the Total Surface Area of a cone is $\textrm{TSA} = \pi r^2 + \pi r s$ where $r$ is the radius and $s$ is the slant height. Note that $\pi r^2$ is the area of the circular base, so $\p...
4
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*Urgent* Differential Equations Need to find the general solution of: y" + (1+2i)y' + (i-1)y = 0 There are numerous methods to solve 2nd Order Linear DE's, has your teacher specified a method to use? i.e. Method of Un-Determined Coefficients, Linear D operators (Forming an Auxillary eqn etc) ? If none is specified, fo...
5
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mathematical induction again July 30th 2007, 10:15 AM #1 Newbie Joined Jul 2007 Posts 5 mathematical induction again I need to use mathematical induction to prove $2^n<n!$ for all n>=4. The base case is easy, and in the inductive step I get to $2(2^n)<(n+1)n!$ But am I going in the wrong direction, or am...
4
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Check my calculations ^_^ July 1st 2006, 11:58 PM #1 Junior Member Joined Jan 2006 Posts 38 Check my calculations ^_^ I keep trying this question over and over again, and keep getting the wrong answer. I was wondering if somebody would be nice enough to check my calculations, and see where I went wrong (...
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Minimium value if x+y=1 then what is the min. value of x^3+y^3+xy ? Another way to do it: $abla x+ y= <1, 1>$, $abla x^3+ y^3+ xy= <3x^2+ y, 3y^2+ x>$. We must have $3x^2+ y= \lambda$, $3y^2+ x= \lambda$ for some number $\lambda$, as well as x+y= 1. So $3x^2+ y= 3y^ 2+ x$ which says that $3x^2- 3y^2+ y- x= 3(x- y)(x+ ...
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Conversions Guide For Square Whenever the terms square and round cake tins enter a conversation, you can be assured that a question related to either of the following with crop up: Question 1. Volumes For a given size of tin, which one will hold a larger volume? Question 2. Recipes How do I adjust a recipe from a sq...
4
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Math Help January 11th 2009, 08:48 AM #1 Member Joined Nov 2008 Posts 79 parabola In need to write an equation for the parabola whose vertex is (4, 3), axis of symmetry is y = 3 and the measure of the latus rectum is 4; a > 0. I also need to draw this parabola. A parabola is the set of all points i...
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kinda hard exponent problem 1. September 16th 2011, 07:33 AM #1 2. September 16th 2011, 08:38 AM #2 Re: kinda hard exponent problem Reform the given equation to $y=...$ Afterwards replace $x$ by $2x$. Then you'll see $y$ is increased by a factor ... ? 3. September 16th 2011, 08:44 AM #...
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"Let f and g be twice differentiable functions ..." - Derivitive problem March 11th 2009, 03:36 PM JTG2003 "Let f and g be twice differentiable functions ..." - Derivitive problem There's a problem that our professor wanted us to look at and I'd really like to understand it. It says "Let f and g be twice di...
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Complex numbers Factorization Hello, I want to factorize the equation Z^n=1 over complex numbers I reached (x-1)(X^4+X^3+X^2+x+1) andd then got stucked First of all, I don't know where x and X have come from, since your equation is in terms of z... Anyway, let $\displaystyle z = r\,e^{i\theta}$, then \displaystyle \be...
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find x and z which maximizes.. January 26th 2007, 02:16 PM chogo find x and z which maximizes.. does anyone know how to do this find x and z that maximizes ln(4-x) + ln(4+z) + ln(z) subject to 2 lnx + ln(4-z) + ln(4-z) = 2ln(32/7) anyhelp is much appreciated January 26th 2007, 02:51 PM Capt...
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Need newbie help on Relations December 8th 2007, 09:28 PM #1 Newbie Joined Dec 2007 Posts 4 Need newbie help on Relations I'm stuck on relations, more specific on how to determine if something is reflexive, symmetric, antisemmetric and transitive I understand everyone but transitive, Yea, I've read ...
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Equality Problem in Infinite-Dimensional Hilbert Spaces Abstract and Applied Analysis Volume 2013 (2013), Article ID 813635, 5 pages http://dx.doi.org/10.1155/2013/813635 Research Article Regularization Method for the Approximate Split Equality Problem in Infinite-Dimensional Hilbert Spaces Department of Mathematics...
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Finding Green's Function for ODE [Math]u''+u = f(x)[/tex] $0<x<R$ $u(0) = 0 u(R) = 0$ 1. Solve homogeneous equation $u'' + u = 0 \Rightarrow u = a\cos x + b\sin x$ 2. $LG(x,s) = 0$ for $x eq s$ $x < s, G_1(x,s) = a_1(s)\cos x + b_1(s) \sin x, G(0, s) = 0 \Rightarrow a_1(s) = 0$ $x > s, G_2(x, s) = a_2(s)\cos x + b_2(s...
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Number of divisors problem December 6th 2010, 06:03 PM Arzx Number of divisors problem I'm trying to solve the problem of how many solutions (x,y) there are to: $1/x + 1/y = 1/n$ for a fixed positive integer n and positive integers x and y. I've been told that this equates to finding the # of diviso...
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Edge Colorings of Directed Graphs which Respect an Involution up vote 5 down vote favorite Let G be a graph and let C be a set of coloring. Suppose that there is an involution $\phi$ from C to C. We can think about the element of C as the nonzero elements of some Abelian group and $\phi(x) =-x$. (For concreteness we ...
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Math Help June 12th 2009, 07:30 PM #1 Newbie Joined Jun 2009 Posts 5 modulus 1. simplify (9mod2x-1)-(2mod6x-3) and solve the equation 9mod2x-1 = (9+2mod6x-3) 2.find the values of a and b for which 2x^2+4x-3 can be expressed in the form (2x+a)^2 +b More parentheses! Do you mean '9 (mod 2) x...
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Calculus Help 1. February 22nd 2006, 12:49 PM #1 Calculus Help Last edited by MathGuru; February 22nd 2006 at 01:49 PM. 2. February 22nd 2006, 09:03 PM #2 The usual trapezoidal approximation for a definite integral is: $<br /> \int_a^b f(x)\ dx=\frac{h}{2} (y_0 + 2y_1+2y_2+...+2y_{...
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Need Help setting up word problems March 19th 2009, 05:16 PM #1 Junior Member Joined Feb 2009 Posts 31 Need Help setting up word problems Here are a couple of word problems that are hard to for me to start. If anyone could help, it would be greatly appreciated. thanks!! Problem 1: The sum of 2 n...
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polynomial Inequalities October 4th 2013, 07:30 AM darkangel06 polynomial Inequalities The function s(t)= -1/2gt^2 +v[0]t +S[o] can be used to calculate s, the height above a planet's surface in meters, where g is the acceleration due to gravity t is the time in seconds,V[o] is the initial velocity in meters...
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max, min, inflections October 25th 2006, 12:15 PM #1 Junior Member Joined Oct 2006 Posts 71 max, min, inflections . Let f(x) = x2ex (a)Find all of the local maxima and minima (b)find point of inflection (c)determine largest interval in which f(x) is concave downward. (d) evaluate lin x->-...
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Finding the square June 2nd 2009, 08:24 PM #1 Newbie Joined May 2009 Posts 12 Finding the square Can someone please explain to me the steps of how to complete the square and then write the parabola y=x^2+6x+5 in the form (x-h)^2 = 4a(y-k). Also from this how do I find the vertex, focus and the equat...
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Solitary Wave Solutions of the Boussinesq Equation and Its Improved Form Mathematical Problems in Engineering Volume 2013 (2013), Article ID 468206, 8 pages http://dx.doi.org/10.1155/2013/468206 Research Article Solitary Wave Solutions of the Boussinesq Equation and Its Improved Form ^1Young Researchers and Elite Cl...
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Non-isomorphic groups of order 42. February 15th 2009, 07:44 AM #1 Member Joined Aug 2008 Posts 97 Non-isomorphic groups of order 42. Is the following argument correct, thanks I want to find 3 non-isomorphic groups of order 42. 1) C_42 th cyclic group of order 42 is cyclic hence abelian. 2)...
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Sketching a node, can anyone answer this query? December 20th 2012, 04:51 AM darren86 Solved: Sketching a node, can anyone answer this query? i've got the dynamical system: xdot=-2x ydot=-y Now I have solved the system and found the general solution: x(t)=Ae(^-2t)v + Be(^-t)u, where v=(1,0), u...
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the encyclopedic entry of red black A red-black tree is a type of self-balancing binary search tree , a data structure used in computer science , typically used to implement associative arrays . The original structure was invented in 1972 by Rudolf Bayer who called them "symmetric binary B-trees ", but ...
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Classification of Exact Solutions for Generalized Form of Abstract and Applied Analysis Volume 2013 (2013), Article ID 742643, 11 pages http://dx.doi.org/10.1155/2013/742643 Research Article Classification of Exact Solutions for Generalized Form of Equation Department of Mathematics, Faculty of Science, Firat Unive...
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Interpolation Methods for Stochastic Processes Spaces Abstract and Applied Analysis Volume 2013 (2013), Article ID 152043, 12 pages http://dx.doi.org/10.1155/2013/152043 Research Article Interpolation Methods for Stochastic Processes Spaces ^1Lomonosov Moscow State University (Kazakh Branch) and Gumilyov Eurasian Na...
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I need to solve this D. E. (( plz help ) #2 Suppose you had $x-e^x=c$ and you know that if you can put it into the form $k=ge^{g}$, then you can take the Lambert W function of both sides and obtain $g=W(k)$. So, can you get $x-e^x=c$ into the form $-(x-c)e^{-(x-c)}=-e^{c}$ and then taking the W function of both sides g...
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Need help Solid Geometry July 30th 2013, 02:58 AM #1 Newbie Joined Jul 2013 From Philippines Posts 5 Need help Solid Geometry We had this as a seatwork..couldn't answer it. My classmates answered it but I am doubtful about their answers I'll explain later 1. Given right circular cylinder circums...
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Taylor series calculation and approximation help please October 27th 2012, 01:10 PM #1 Newbie Joined Oct 2012 From Edmonton Posts 13 Taylor series calculation and approximation help please Calculate the Taylor series for (x^5) + (3x^2) - x - 1 about x= 1. Calculate it's radius of convergence. How acc...
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Algebraic Characterization of Isometries of the Hyperbolic 4-Space ISRN Geometry Volume 2012 (2012), Article ID 757489, 12 pages http://dx.doi.org/10.5402/2012/757489 Research Article Algebraic Characterization of Isometries of the Hyperbolic 4-Space Indian Institute of Science Education and Research (IISER) Mohali,...
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Line Integrals P: 1,047 Thanks, HallsofIvy, but I wasn't referring to integrals of vector functions. Here are examples of the types of integrals I meant. Say we have a function f(x,y)=2x (so it's actually independent of y) and the curve y=x^2 and we want the integral of that function along the curve from (0,0) to (1,...
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Borel-Cantelli lemmas August 14th 2009, 03:47 AM #1 Junior Member Joined Sep 2008 From Boston, Massachusetts Posts 41 Characteristic Function of a symmetric RV A random variable $X$ is called symmetric if $X$ and $-X$ have the same distribution. Show that the characteristic function of a symmetric ra...
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An integral - Riemann's derivation of number of primes November 12th 2010, 05:43 PM #1 Member Joined May 2008 From Melbourne Australia Posts 203 Thanks 15 An integral - Riemann's derivation of number of primes OK so I am not sure if this problem is analysis, number theory or calculus. I am r...
4
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NUKEFACT NUKEFACT #33 THE ANATOMY of a REACTOR SCRAM last update October 15, 1998 Reactor scram is used for rapid reactor shutdown ... the ultimate safety action used to prevent reactor core damage in abnormal or emergency situation...
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Non-observable vs. observable heterogeneity factor September 11, 2013 By arthur charpentier This morning, in the ACT2040 class (on non-life insurance), we’ve discussed the difference between observable and non-observable heterogeneity in ratemaking (from an economic perspective). To illustrate that point (we will sp...
5
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Help with rref function March 16th 2009, 11:14 AM #1 Newbie Joined Mar 2009 Posts 5 Help with rref function I have a Ti30x and my instructor is telling me that I need to perform this problem using the rref function, which the Ti30x doesnt have. I have to show a ck for my solution also. Can anybody he...
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Innovation: Accuracy versus Precision A Primer on GPS Truth By David Rutledge True to its word origins, accuracy demands careful and thoughtful work. This article provides a close look at the differences between the precision and accuracy of GPS-determined positions, and should alleviate the confusion between the ter...
4
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Finding the trig expression May 12th 2010, 12:03 AM #1 Super Member Joined Dec 2008 Posts 509 Finding the trig expression Hi I am having trouble getting the expression for the following: 1) Write $\frac{tan^2(x)+sec^2(x)}{tanxsec(x)}$ in terms of sin(x) This is what i have done so far: ...
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well-ordering principle November 7th 2007, 01:31 PM #1 well-ordering principle Let a and b be positive integers. By the well-ordering principle the non-empty set of positive integers am+bn such that m,n are integers and am+bn is greater than 0 has a minimum element c. Prove by contradiction that c is a commo...
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sketch We have $f(z)=z^3,\quad 0<r\leq 2/3,\quad 0\leq t\leq \pi/4$ then consider $f(z)=r^3 e^{3 it}$ and just for now, let r=1, and t go from 0 to $\pi/4$ then wouldn't that be an arc of radius one but going from 0 to $3\pi/4$? Same dif for all the other arcs as the radius goes from zero to $2/3$ then we have the piec...
4
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changing expression September 26th 2009, 12:15 PM Tweety changing expression Hi, I was just wondering if you have an expression like this $sec^{4} \theta - tan^{4} \theta$ and if I take the sqaure root of this expression would it end up looking like this ; $sec^{2} \theta - tan^{2} \theta$? thanks!...
4
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trigonometric March 16th 2009, 08:57 PM #1 Newbie Joined Mar 2009 Posts 1 trigonometric I have 2 questions: 1. find for z ; where z^3=sqrt[imaginary] 2. Simplify: sin x/(1-cos x) can somebody help me with these 2 questions showing working out? Please & Thank You Last edited by...
5
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A question on Bijective functions October 23rd 2012, 02:31 AM barbiedise A question on Bijective functions I was just taught a formula to solve bijective functions, its shown below: a[(x +b/2a)^2 - (b^2 - 4ac)/4a^2] It was used to solve the following problem: f(x) = 4x^2 - 2x + 3 write f(x) i...
5
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I can't transform this correctly. December 1st 2011, 07:44 PM #1 Newbie Joined Nov 2011 Posts 7 I can't transform this correctly. With this transformation problem, I need to transform cotxcosx + sinx into cscx and I've been at this for a while and would like to know how to do it correctly. Re: I can't t...
4
[ -0.0810546875, 0.07177734375, -0.005767822265625, 0.050537109375, 0.029052734375, 0.09912109375, -0.031982421875, -0.07958984375, 0.017578125, -0.0010223388671875, 0.035400390625, -0.0615234375, 0.0133056640625, 0.002655029296875, 0.021240234375, -0.0242919921875, 0.03369140625, 0....
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Triangle Ratios November 11th 2009, 04:33 AM #1 Junior Member Joined Sep 2009 Posts 32 Triangle Ratios Triangle ABC is a 30-60-90 triangle, where A is 30º, B is 90º, and C is 60º. A segment BD is the drawn altitude to AC, forming ΔADB, then DE is the altitude drawn to AB,forming new ∆ADE. Then, EF is...
4
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convergence or divergence sqrt(n^2+n)-n |cos(n*pi/2)+sin(n*pi/2|(2n-1)/(n+2) i can kind of start the first one and can't start the second one. any ideas? So do you not want help with the first one? I cannot understand what you mean at all in number 2. Please rewrite with more parentheses. I don't know what you mean by...
5
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Answer 3 (applications-differentiation-5) NOTE: This question is fairly sophisticated and is here to show you some of the complications that can occur. If you don't fully understand it now, don't worry! 1. x-intercepts `y=x^5-5x^4` `=x^4(x-5)` `=0` when `x = 0`, `x = 5` 2. y-intercepts: When ...
5
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Problem 17 January 29th 2007, 07:20 AM #1 Global Moderator Joined Nov 2005 From New York City Posts 10,616 Thanks 9 Problem 17 1)Take any three digit number with different digits. Reverse the order of the digits. And find the difference between these two numbers. Consider this result as a three d...
5
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Linear algebra question May 9th 2007, 03:21 PM faure72 Linear algebra question If anyone could explain how the following is done, it would be greatly appreciated! *Note that (+) denotes the vector addition symbol (which is displayed in textbooks as a circle with a plus sign inside it) Here is a vector ...
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Prime numbers From HaskellWiki 1 Simple Prime Sieve The following is an elegant way to generate a list of all the prime numbers in the universe: primes :: [Integer] primes = sieve [2..] where sieve (p:xs) = p : sieve [x | x<-xs, x `mod` p /= 0] While simple, this method is rather inefficient and not recomm...
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Public Project Portfolio Optimization under a Participatory Paradigm Applied Computational Intelligence and Soft Computing Volume 2013 (2013), Article ID 891781, 13 pages http://dx.doi.org/10.1155/2013/891781 Research Article Public Project Portfolio Optimization under a Participatory Paradigm ^1Faculty of Engineeri...
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2. Graphs of 2. Graphs of y = a sin bx and y = a cos bx by M. Bourne The variable b in both of the graph types • y = a sin bx • y = a cos bx affects the period (or wavelength) of the graph. The period is the distance (or time) that it takes for the sine or cosine curve to begin repeating again. Interactive - ...
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Programming for all, part 2: From concept to code Do one thing, and do it well In our first installment, we wrote several programs that really did nothing more than illustrate a concept. Let's turn the complexity up a notch and compose a program that actually solves a problem. The problem we are tasked with: given t...
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[SOLVED] Equation of a plane - Given z intercept and parametric equation May 23rd 2010, 10:05 AM #1 Member Joined Sep 2009 Posts 83 [SOLVED] Equation of a plane - Given z intercept and parametric equation Hey, I have been working on this question for the past couple days (searching the internet, sea...
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Law of an application March 14th 2010, 08:40 AM #1 Law of an application Hi, I'm currently reading a paper, and I'm having difficulties in grasping the concept of a tree, and more precisely this : Let $\mathbb{T}~:~ \Omega \to\Omega$ be the identity application. Let $(p_k,k\geq 0)$ be a probability...
5
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New Travelling-Wave Solutions for Dodd-Bullough Equation Journal of Applied Mathematics Volume 2013 (2013), Article ID 364718, 5 pages http://dx.doi.org/10.1155/2013/364718 Research Article New Travelling-Wave Solutions for Dodd-Bullough Equation ^1School of Information, Beijing Wuzi University, Beijing 101149, Chin...
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Flagpole question...sin, cos, tan.....urgent help please November 8th 2007, 12:23 PM #1 Member Joined Aug 2007 Posts 182 Flagpole question...sin, cos, tan.....urgent help please I have this problem...i know the answer (from the back of the book) but I have no idea how to solve this....could someone pleas...
4
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Existence Results for a Coupled System of Nonlinear Fractional Hybrid Differential Equations with Homogeneous Boundary Conditions Abstract and Applied Analysis Volume 2014 (2014), Article ID 672167, 10 pages http://dx.doi.org/10.1155/2014/672167 Research Article Existence Results for a Coupled System of Nonlinear Fra...
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Help With A Grid Looks like this to me: Rectangular portion below first roof angle is 5 X 8 minus the doors (6) = 34 squares From first roof angle to second roof angle we have a trapezoid with bases 8 and 4 with height 1. Using $A=\frac{1}{2}h(b_1+b_2)$, we can find the area of the trapezoid to be 6 squares The remaini...
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diophantine equation problem August 31st 2008, 06:53 PM #1 Junior Member Joined Aug 2008 Posts 42 diophantine equation problem Find all solutions to the equation $x^2 + y^3 = z^2,\ x>0,\ y>0,\ z>0,\ (x,y,z)=1$ not a clue where to start with this. The book does not say anything about what to do when ...
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Calc related rates September 3rd 2009, 05:55 AM #1 Junior Member Joined May 2008 Posts 27 Calc related rates Hello, can someone please help me to set this problem up. Let theta(in radians) be an acute angle in a rt triangle, and let x and y respectively be the lengths of the sides adj and opp to theta. ...
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cost volume profit and break even February 15th 2010, 06:56 PM #1 Member Joined Nov 2008 From windsor ont cAN Posts 87 cost volume profit and break even a) Sales = T R = 1,200,000 VC = TVC / TR = 50% FC = 400,000 TVC = 600,000 N.I. ( S – VC ) x – FC > N.I.= ( 1 – 0.5 )x – 400,000...
4
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The Effect of Energy Leakage Probability on Burn Propagation in an Optically Thick Fusion Plasma ISRN High Energy Physics Volume 2012 (2012), Article ID 838394, 10 pages http://dx.doi.org/10.5402/2012/838394 Research Article The Effect of Energy Leakage Probability on Burn Propagation in an Optically Thick Fusion Pla...
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Stock Valuation with Constant Growth Rate March 14th 2010, 01:35 PM #1 Hi, This is my first time posting on this forum. If a company pays a quarterly dividend of $0.75, with a dividend growth rate of 6% per year (indefinitely), and with a required rate of return of 14%, what is the price of the stock? ...
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integral of trig function April 27th 2007, 09:00 PM #1 integral of trig function Hey All, I wanted to know when you integrate sin^4x where the 4 comes from in the integral. ∫sin^4x dx= ∫(sin^2x)^2 dx= ∫(1-cos2x)^2/4 dx thank you I'm sure you've seen the trig identities enough to be familiar wi...
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Probability of having the same birthday February 18th 2010, 03:38 AM #1 Newbie Joined Jan 2010 Posts 7 Probability of having the same birthday I think I know how to do the problem, but I run into the problem that in Excel, the numbers that need to be calculated are too large and thus I cannot get an answ...
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need help with a trig problem this is the problem: 2 csc²x=3 cot²x-1 this is what I have so far: see attached file $\frac{2}{sin^2(x)} = \frac{3cos^2(x)}{sin^2(x)} - 1$ Getting the same denominator on the right: $\frac{3cos^2(x) - sin^2(x)}{sin^2(x)}$ Now $sin^2(x)$ will cancel $2 = 3cos^2(x) - sin^2(x)$ $2 = 3cos^2(...
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directional dervitives. April 22nd 2009, 04:29 PM #1 directional dervitives. given f(x,y)=x^2+y^2-2x-4y find all points at which the direction of the directional dervitive of fastest change u=i + j, i did the maximinzing the directional dervitive and stuff i got all points on the line 1-x=y the book has y=1+x...
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A-algebra, element that is integral and finite A-module, explanation a proof December 12th 2012, 12:02 AM #1 Member Joined Sep 2010 From Germany Posts 112 Thanks 4 An A-algebra, element that is integral and finite A-module, proof explanation let $\varphi A\to B$ be an A-algebra and let $y\in B$ t...
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Testing Series for Convergence/Divergence May 16th 2010, 01:44 PM #1 Newbie Joined May 2010 Posts 1 Testing Series for Convergence/Divergence Hey everyone, I'm doing some practice problems to study for my calculus exam and can't seem to figure this one out. What am I missing? sum from n=1 to infinit...
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Is it possible to find out the length of X in this diagram? 1. May 15th 2012, 08:00 AM #1 2. May 15th 2012, 08:45 AM #2 Re: Is it possible to find out the length of X in this diagram? I assume these are squares inscribed in circles. Let the circle radius be r. From trigonometry or Pythagorean theorem it...
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Three boxes of supplies have an average weight of 7 kgs and Author Message TAGS: Three boxes of supplies have an average weight of 7 kgs and [#permalink] 28 Sep 2007, 10:18 ...
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Evolutionary Game Theory-Based Collaborative Sensing Model in Emergency CRAHNs Journal of Electrical and Computer Engineering Volume 2012 (2012), Article ID 696571, 14 pages http://dx.doi.org/10.1155/2012/696571 Research Article Evolutionary Game Theory-Based Collaborative Sensing Model in Emergency CRAHNs Departmen...
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Word Problem June 6th 2010, 10:00 PM #1 Newbie Joined May 2010 Posts 15 Word Problem A car is traveling at 50 mi/h when the brakes are fully applied, producing a constant deceleration of 36 ft/s2. What is the distance covered before the car comes to a stop? (Give your answers correct to one decimal p...
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Comparison of Reproducing and Nonreproducing Starprobe Strategies Comparison of Reproducing and Nonreproducing Starprobe Strategies for Galactic Exploration Francisco Valdes...
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Quadratics Factoring 2 April 21st 2013, 11:43 AM #1 Member Joined Feb 2013 From Canada Posts 131 Quadratics Factoring 2 Factor: 3(2z + 3)^2 - 9(2z + 3) - 30 My attempt: 3(2z + 3)^2 - 9(2z + 3) - 30 3x^2 - 9x - 30 Replace (2z +3)^2 and (2z +3) with a variable (I choose x) 3(x^2 - 3...
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surface area of a light bulb December 2nd 2008, 10:29 PM BigPapa surface area of a light bulb can someone how to do this problem please? Find the surface area of an ornamental light bulb designed by revolving the graph of y=(1/3)x^(1/2)-x^(3/2), on the interval 0 to 1/3, about the x axis. December 2nd 2008...
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Dynamics question involving impulse momentum April 20th 2008, 04:40 PM #1 Member Joined Jun 2006 Posts 93 Dynamics question involving impulse momentum The question is: A 5oz baseball is 3ft above the ground when it is struck by a bat. The horizontal distance to the point where the ball strikes the g...
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Integration of Exponential Functions Hello Sarah, use substitution: $u(x)=1+2^x=1+e^{\ln(2) \cdot x}\ \Longrightarrow\ \frac{du}{dx}=\ln(2) \cdot e^{\ln(2) \cdot x}=\ln(2) \cdot 2^x$. That means: $du=\ln(2) \cdot 2^x \cdot dx$ With $\ int{\frac{2^x}{1+2^x}}dx=\frac{1}{\ln(2)}\int{\fr ac{\ln(2) \cdot 2^x}{1+2^x}}dx=\fra...
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Calculus (Derivatives of Inverse Functions) Posted by Mooch on Thursday, March 15, 2012 at 11:35am. Suppose f(x) = sin(pi cos(x)). On any interval where the inverse function y = f^-1(x) exists, the derivative of f^-1(x) with respect to x is: I've come as far as y = arccos ((arcsin(x))/pi), but I am not certain this i...
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need help for simultaneous equation August 23rd 2009, 10:36 PM #1 Junior Member Joined Aug 2009 Posts 31 the two equations are -2x -5y =21 9x -7y = -65 I have tried all methods and i keep getting different answers, could somebody help me? $\left\{\begin{array}{ll}-2x-5y=21\\9x-7y=-65\e...
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Probability Density Functions Variance September 25th 2009, 12:50 PM #1 Junior Member Joined Sep 2009 From Over there Posts 30 Probability Density Functions Variance I know how to calculate the variance of a set of numbers but not of a probability density function. I'm guessing it requires some calcu...
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Learn about Division of Fractions Learn about Division of Fractions This video lesson covers division of fractions. We’ll solve two problems. The first one, let’s do this first, is 7/15÷4/5. We’ve got two fractions. One is dividing the other. Now, first thing we need to know is the division of fractions is the same as ...
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The use of weakening October 4th 2011, 10:19 AM #1 Junior Member Joined Jul 2011 Posts 53 The use of weakening I'm a bit confused by the use of /\ and \/ weakening, I've the following exercise. Show that $(P \implies Q) \implies \lnot P \models \lnot P \lor \lnot Q$ Now I can go about the lefthan...
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the encyclopedic entry of symmetric matrices In linear algebra , a symmetric matrix is a square matrix , A , that is equal to its transpose $A = A^\left\{T\right\}. ,!$ The entries of a symmetric matrix are symmetric with respect to the main diagonal (top left to bottom right). So if the entries are writ...
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fermat...or not fermat? October 22nd 2006, 09:10 AM #1 Junior Member Joined Sep 2006 Posts 26 fermat...or not fermat? proove that if a prime number is represented by this phormula p=(2^n)+1 with n>0 then n is a power of 2... it's all for you... The important fact is that, we can factor: $x^n+y^n...
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Rational numbers with dense orbits in [0,1] under iteration by f(x)=4x(1-x) up vote 11 down vote favorite 3 Let $f(x)=4x(1-x)$. For which rational numbers $r\in [0,1]$ is the sequence $f^n(r)$, $n\in \mathbb N$, dense in $[0,1]$ ? $(f^n(r)=f\circ f\circ ...\circ f(r)$ n times) I would be happy to find a single rati...
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The Effects of MHD Flow and Heat Transfer for the UCM Fluid over a Stretching Surface in Presence of Thermal Radiation Advances in Mathematical Physics Volume 2012 (2012), Article ID 702681, 21 pages http://dx.doi.org/10.1155/2012/702681 Research Article The Effects of MHD Flow and Heat Transfer for the UCM Fluid ove...
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Need help on simplifying each of the following. September 23rd 2007, 09:52 AM #1 Member Joined Sep 2007 Posts 140 Need help on simplifying each of the following. I'd appreciate any help that I get in solving these problems. I'll upload an image because it'll be easier for you all to read the problem...
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Uniform Attractor and Approximate Inertial Manifolds for Nonautonomous Long-Short Wave Equations Abstract and Applied Analysis Volume 2013 (2013), Article ID 830715, 17 pages http://dx.doi.org/10.1155/2013/830715 Research Article Uniform Attractor and Approximate Inertial Manifolds for Nonautonomous Long-Short Wave E...
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More Trigonometric Help Need! August 25th 2008, 10:54 AM nee More Trigonometric Help Need! solve the equation for solutions over the interval [0, 360) 4cos(squared)x + 4cosx = 1 I'm completely lost on this one! August 25th 2008, 11:11 AM Moo Hi ! Quote: For you to better understand, su...
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Equation of a tangent line October 31st 2008, 03:33 PM #1 Newbie Joined Oct 2008 Posts 2 Equation of a tangent line I have the following exponential equation (x^3 + 2)(x^2 + X) Find the equation of the tangent line when x=1 This is what I do to get the derivative (3x^2)(x^2 + x) + (2x ...
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Slope of the perpendicular line question February 9th 2011, 04:07 PM #1 Member Joined Nov 2010 Posts 119 Slope of the perpendicular line question Question: At what point on the curve $y=-2x^4$ is the tangent line perpendicular to the line $x-y+1=0$? What I did was set the derivative of the curv...
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Math Help May 24th 2010, 07:28 PM #1 Newbie Joined Aug 2007 Posts 21 Hello, I am stumped on this question. I think I'm missing something really obvious but here is goes. "You have been asked to design a 1000cm^3 can shaped like a right cylinder. What dimensions will use the least material?" ...
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Modeling Trick: the Signed Pseudo Logarithm March 1, 2012 By John Mount Much of the data that the analyst uses exhibits extraordinary range. For example: incomes, company sizes, popularity of books and any “winner takes all process”; (see: Living in A Lognormal World). Tukey recommended the logarithm as an important...
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Running Characteristics of Aerodynamic Bearing with Self-Lifting Capability at Low Rotational Speed Advances in Tribology Volume 2011 (2011), Article ID 973740, 10 pages http://dx.doi.org/10.1155/2011/973740 Research Article Running Characteristics of Aerodynamic Bearing with Self-Lifting Capability at Low Rotational...
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one of those "stupid" proofs July 13th 2010, 07:53 PM #1 Newbie Joined Jul 2010 Posts 23 one of those "stupid" proofs Hi all, I have to do this problem according to the first part of the Fundamental Theorem of Calculus. Fundamental theorem of calculus - Wikipedia, the free encyclopedia h(x)= (integr...
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