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Equation of The Plane March 10th 2009, 11:37 PM #1 Newbie Joined Nov 2008 Posts 24 Equation of The Plane Find the equation of the plane (if it exists) containing the two lines: A) R1(t)= <1-t, t, 3+2t> ; R2(t)= <t, 1+t, 5-2t> B) R1(t)= <1+3t, -2t, -1+t> ; R2(t)= <6t,1-4t,3+2t> C) R1(t)= <t...
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What is an Euler-Fokker genus? In ancient times the Greeks made a distinction between different genera. The fourth was the interval between the two extreme tones of the tetrachord. Two other tones divided this distance into three intervals, in various different ways. This multiformity gave rise to a system of classifi...
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Which subsets of R^3 are subspaces? April 19th 2010, 08:44 PM iExcavate Which subsets of R^3 are subspaces? SUBSPACES (Headbang)! Hi, I don't understand subspaces! I came across this question in homework tasks, and I'm guessing it's very important to the course?! Which of the following subsets of R^3 a...
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definite integral answer different from Riemann Sum calc May 18th 2008, 07:15 PM #1 Newbie Joined Feb 2008 Posts 9 definite integral answer different from Riemann Sum calc Hi everybody, I have to calculate a definite integral using the oh so necessary Riemann Sum. I first calculated the integral...
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Math Help October 28th 2008, 11:38 AM #1 Junior Member Joined Oct 2008 Posts 25 INDICES a) express 27 to the power of a 1/2 as a power of 3 b) express root 2 as a power of 8 c) express root 2 divided by 16 as a power of 2 how exactly do you go about these Q's and what does it mean by expr...
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Homology theory constructed in a homotopy-invariant way up vote 17 down vote favorite 7 Singular homology sends homotopic morphisms on equal morphisms and weakly equivalent spaces on isomorphic objects. So singular homology is in fact defined on the homotopy category of topological spaces. But the usual definition of...
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What axioms are stronger than the Axiom of choice? MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required. What other axioms in set theory are stronger than AC ? I mean what are those axioms that will imply AC ? up vote 4 down ...
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Acceptance Sampling A tutorial on how to develop sampling plans that detect and prevent the use of unacceptable materials and services. By Stan Hilliard © 1999 H & H Servicco Corp. Outline ┌──────┬────────────────────────────────────────────────────────┐ │ PAGE │ TUTORIAL...
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sicp-ex-2.5 ;; Constructor (define (cons a b) (* (expt 2 a) (expt 3 b))) ;; Enables us to calculate the log of n in base b (define (logb b n) (floor (/ (log n) (log b)))) ;; Selectors (define (car x) (logb 2 (/ x (gcd x (expt 3 (logb 3 x)))))) (define (cdr x) (logb 3 (/ x (gcd x (expt 2(logb 2 x)))))) I had ori...
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Generalized Towers of Hanoi - Optimal Algorithm Generalized Towers of Hanoi - Optimal Algorithm Follow ...
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Determining all the zeros of a function March 5th 2011, 09:20 AM #1 Junior Member Joined Feb 2011 Posts 58 Determining all the zeros of a function Determine the zero's f(x) = kx^3 - 8x -x +3k + 1 k=3 and has a zero when x = 2 3x^3 - 8x^2 - x + 3(3) + 1 = 3x^3 - 8x^2 - x +10 <<<<< don't k...
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Quadratic formula May 27th 2008, 04:40 PM #1 Newbie Joined May 2008 Posts 2 Quadratic formula Can someone help me? Please, I'm really confused. Anyone help would be appreciated. I'm not really sure what to do w/ the x's in the equation.... heres the link to the equation: http://img100.im...
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Complex analysis - integrating over a contour November 16th 2012, 06:59 PM alphabeta89 Complex analysis - integrating over a contour Let $0 < |\alpha| < 1$. Find $\displaystyle{\int_{\gamma}\frac{\mathrm{Re}(z)}{z-\alpha}dz}$ in terms of $\alpha$, where $\gamma$ is the circle $|z| = 1$ oriented in the ...
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Stepper/time equation problem June 27th 2012, 02:44 PM #1 Newbie Joined Jun 2012 From London Posts 1 Stepper/time equation problem Hi, I have an equation that I have been staring at for hours. Hope this is in the right section, it's a weird one. i have a stepper motor attached to a clock to essen...
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Models of separable equations (population growth, half life, interest) September 14th 2013, 06:10 PM #1 Newbie Joined Sep 2013 From Broken Arrow Posts 4 Models of separable equations (population growth, half life, interest) Hey all, I'm working the odd problems in section 3.1 of Christian Consta...
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Factoring quadratics March 24th 2009, 03:57 AM #1 Junior Member Joined Jan 2009 Posts 52 Factoring quadratics For example: $<br /> 6x^2 +11x -35<br />$ I've been doing this by trial and error but it takes too long. I tried googling "factoring quadratics" but when it comes to examples like this, ...
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Simple exponential integral That's good. But I'm looking for a solution in which integration by parts is NOT used. Consider $y = t \sin t$. Then $\frac{dy}{dt} = \sin t + t \cos t$. Now integrate both sides: $y = \int \sin t + t \cos t \, dt = \int \sin t \, dt + \int t \cos t \, dt$. Substitute $y = t \sin t$: $t \si...
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ing Back to Mathematics and Politics In many situations, voting is not "one person-one vote." For example, the stockholders of a company usually have one vote for each share of stock owned in the company. Thus, some people may have many votes (have much power) while other voters may have only a few votes (have little ...
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Market equilibrium March 23rd 2009, 03:59 PM #1 Newbie Joined Mar 2009 Posts 11 The supply function is 2p-q=50. Demand function is pq=100=20q. What are the price and quantity of market equilibrium? I can't figure this out. I think you have to isolate "p" and set the two equations equal to ea...
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Groups - discrete math In G={x∈R | x>1} is defined operation * with x*y = xy-x-y+2. Show that {G,*} is Albelian group thanks Re: Groups - discrete math Re: Groups - discrete math we need to show 4 things: 1. * is an associative binary operation on G. this means two things: a) x*y has to be in ...
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Joint distrib of gamma distribs October 31st 2009, 09:48 AM isarutas Joint distrib of gamma distribs Let X_i, with i \epsilon {1,2,3} be independant r.v. and suppose that X_i \epsilon Gamma(r_i,1). Now set: Y_1= X_1/(X_1+X_2) Y_2= (X_1+X_2)/(X_1+X_2+X_3) Y_3= X_1+X_2+X_3 Determine the joint ...
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Curve of intersection with two surfaces May 10th 2008, 08:47 PM #1 Junior Member Joined Apr 2008 Posts 37 Curve of intersection with two surfaces Show that the curve with vector equation $r(t) = <2 cos^2(t), sin(2t), 2sin(t)>$ is the curve of intersection of the surfaces $(x-1)^2+y^2 = 1$ and $x^2 + y^2 ...
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Triple integration August 22nd 2006, 01:42 PM #1 Newbie Joined Aug 2006 Posts 23 Triple integration Hello, Having problems with a homework question: Part A asks to sketch the solid region bounded in the first octant by elliptic cylinder 2x^2 + y^2 =1, and the plane y + z = 1. I know we hav...
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smallest-nonmember-problem Given a finite set S of non-negative integers, the smallest-nonmember problem (Chapter 1) finds the smallest non-negative integer not in S. For example, { 0 1 3 } -> 2. Here are three solutions, with successive solutions having asymptotically better worst-case behavior than the previous sol...
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Homework Help Posted by Cynthia on Tuesday, August 7, 2012 at 5:52pm. evaluate (integral) xe^2x dx A. 1/6x^2 e^3x+C B. 1/2xe^2x-1/2e^2x+C C. 1/2xe^2x-1/4e^2x+C D. 1/2x^2-1/8e^4x+C Evaluate (integral) e^3x cosh 2x dx A. 1/2e^5x + 1/2e^x +C B. 1/10e^5x + 1/2e^x + C C. 1/4e^3x + 1/2x + C D. 1/10e^5x + 1/5x + C ...
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find the centroid (C.O.M) of a thin plane May 17th 2011, 01:05 AM [nuthing] find the centroid (C.O.M) of a thin plane hi, find the center of mass (or centroid) of a thin plate of constant density covering the given region. (a) The region bounded by y = x^2 and y = 4. I can't seem to get this questi...
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Math Help November 23rd 2008, 03:48 PM #1 Newbie Joined Jun 2008 From Marion, VA Posts 18 Inverse Set up a system belw as a matrix multiplication of the form AB=C. Find the inverse A^-1 of A and use it to solve the system. 3x + -6y + -17z = 288 11x + -17y + 110z = 79 -5x + 7y + 8z = 2...
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Verifying Identities? March 31st 2009, 07:24 AM #1 Newbie Joined Feb 2009 Posts 11 Verifying Identities? I have two questions that I am getting nowhere on: 1. Verify the identity: cotx+tanx=cscxsecx I thought of working on the right side, but I came up with (1/tanx)+(sinx/cosx) and didn't know w...
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m Geometry Concepts: Line Intersection and its Applications By lbackstrom TopCoder Member ...read Section 1 Line-Line Intersection Finding a Circle From 3 Points Reflection Rotation Convex Hull In the previous section we saw how to use vectors to solve geometry problems. Now we are going to learn how to use some b...
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PS - Looking for easy calculation trick Author Message TAGS: PS - Looking for easy calculation trick [#permalink] 16 Feb 2009, 20:14 ...
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sine inequality June 28th 2008, 06:11 AM #1 sine inequality The set of all x in the interval [0, π] for which 2 sin^2 x - 3 sin x + 1 ≥ 0 is? I got three values of x: π/6, 5π/6 and π/2 Options for the question are: A) [π/6, 5π/6] U {π/2} B) [π/6, 5π/6] - {π/2} C) [π/6, 5π/6] D) None ...
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Trapezoidal rule problem August 25th 2008, 11:45 PM #1 Junior Member Joined Nov 2007 Posts 29 Trapezoidal rule problem integral (limits: a = -1 and b = 1) or $5e^-2x^2$ (the Latex max confuse: 5e^-2x^2) using 4 strips. Length = 2 and width = 0.6 $E = 0.677 + 0.677 = 1.354$ $M = 0.169 + 0.1...
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Homework Help Posted by Melinda on Tuesday, January 10, 2012 at 7:16pm. I have no clue what to do on these questions. 1.Two resistors a and b are connected in parallel. The total resistance R in such a circuit is found by formula R= 1/a + 1/b. If R=5/6 ohms and b is one more ohm than a, find the number of ohms in a a...
4
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Integrate 3cos^2(x) April 14th 2009, 12:47 AM ZaZu Integrate 3cos^2(x) Hey guys, Can you please show me a step by step integration for Find the solution for the differential equation : 3Cos^2(x) , y= Pi , x = Pi/2 Thank you ! April 14th 2009, 01:25 AM mr fantastic April 14th 2009, 01:42 ...
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[ -0.0185546875, 0.0262451171875, -0.01226806640625, 0.034423828125, -0.015869140625, 0.00022983551025390625, -0.0615234375, -0.004638671875, 0.0201416015625, -0.021484375, 0.05712890625, -0.02001953125, 0.005096435546875, 0.0002880096435546875, 0.0194091796875, -0.06494140625, 0.01348...
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Definitions of Probability Measure Proof October 11th 2010, 11:17 PM AKTilted Definitions of Probability Measure Proof Hi, I'm wondering if someone can help me with the following questions relating to the following definitions: Given sample space S with event space A probability measure is defined as: 1...
4
[ -0.0810546875, -0.07763671875, 0.05615234375, -0.01507568359375, 0.0054931640625, 0.1748046875, 0.15625, -0.0135498046875, 0.0242919921875, 0.0194091796875, -0.00299072265625, -0.07275390625, 0.0179443359375, 0.00811767578125, -0.0191650390625, 0.020263671875, 0.050537109375, -0.02...
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Bowling balls Solving the nice puzzle below, I found it easier to define a stream coinductively than to define a function from natural numbers inductively. You’re standing in front of a 100 story building with two identical bowling balls. You’ve been tasked with testing the bowling balls’ resilience. The building ...
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[ 0.032470703125, 0.054443359375, -0.026611328125, -0.054931640625, -0.00848388671875, -0.0218505859375, -0.053955078125, 0.00136566162109375, 0.03173828125, 0.053466796875, -0.09765625, -0.03271484375, 0.0096435546875, 0.0859375, 0.055419921875, -0.02197265625, 0.00830078125, 0.0167...
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Confused by alternate method of finding f'(a) February 12th 2011, 06:28 PM #1 Newbie Joined Mar 2010 Posts 13 Confused by alternate method of finding f'(a) I'm having a hard time using: $f'(a)=\lim_{x \to a}\dfrac{f(x)-f(a)}{x-a}$ to find the derivative of $f(x)=x^2-8x+9$ I need to do it u...
4
[ -0.0233154296875, 0.037109375, 0.031982421875, -0.021240234375, -0.0191650390625, 0.0927734375, -0.06396484375, 0.05810546875, 0.0537109375, 0.060791015625, 0.18359375, -0.027587890625, 0.033447265625, 0.0205078125, 0.00909423828125, 0.0211181640625, -0.0289306640625, 0.00248718261...
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The division problem in distribution theory. March 24th 2011, 04:02 PM measureman The division problem in distribution theory. Hi all. Given a distribution v and a smooth f (both on a set X) - how do we find the distribution u such that fu = v? If f is never zero, then u = v/f is the solution. I am try...
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[ -0.0517578125, 0.05908203125, 0.0032958984375, 0.0576171875, 0.06396484375, 0.04931640625, 0.09228515625, -0.0654296875, 0.05078125, 0.00604248046875, 0.103515625, -0.049560546875, 0.047607421875, 0.0654296875, 0.017822265625, -0.051025390625, -0.00457763671875, -0.06298828125, -...
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Limit of Sequence Prove that the limit as n approaches infinity of (2^n)/n! = 0. Any help? Maybe you can show me? Or not if you can't be bothered... Congratulations topsquark on your 1 --- The name of that rule is called the ratio test. If you ever studied infinite series that is what is used. --- I have very elegant...
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Gaussian curvature December 16th 2011, 02:00 PM Sogan Gaussian curvature Hello everybody, when we consider some regular surface $S\subset \mathbb{R}^3$ with constant gaussian curvature. Then my question is: Why and how the curvature does changes, when i multiply the givin scalar product by a constant $a...
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[ -0.0439453125, -0.125, 0.060791015625, -0.06689453125, -0.0169677734375, -0.038330078125, 0.061279296875, 0.0179443359375, 0.0751953125, 0.043212890625, 0.138671875, 0.043701171875, 0.042236328125, -0.037353515625, -0.000530242919921875, -0.064453125, -0.053466796875, 0.03662109375...
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Solving Second Order Differential Equations using Runge Kutta December 20th 2010, 03:20 PM #1 Newbie Joined Dec 2010 Posts 3 Solving Second Order Differential Equations using Runge Kutta 1. The problem statement, all variables and given/known data In aerodynamics, one encounters the following initial...
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differential equation November 4th 2012, 12:36 AM #1 Newbie Joined Oct 2012 From canada Posts 15 differential equation Hello: I have to solve the following differential equation as shown in the attachment please help me how to solve this differential equation Re: differential equation ...
5
[ -0.06689453125, -0.00086212158203125, 0.07177734375, 0.0169677734375, 0.041259765625, 0.0032958984375, 0.007537841796875, 0.047119140625, 0.00830078125, 0.015625, 0.099609375, -0.06640625, 0.013916015625, 0.051513671875, -0.037109375, 0.04736328125, -0.04833984375, -0.060546875, ...
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Euclidean norm of U*x when norm of x is 1! October 1st 2009, 10:26 AM #1 Newbie Joined Sep 2009 Posts 4 Let x be a nx1 vector in Cn and y = U*x is another vector in Cn, where U is a unitary matrix and * represents the conjugate transpose. The Euclidean norm of y equals 1 if and only if the Euclidean ...
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Homework Help Posted by Shubham on Thursday, May 22, 2008 at 9:33am. sin(x)+cos(x)=2/3 find the value of sin(x) • Maths - Reiny, Thursday, May 22, 2008 at 10:25am square both sides sin^2 x + 2sinxcosx + cos^2 x = 4/9 1 + sin 2x = 4/9 sin 2x = -5/9 2x = 213.75 or 2x = 326.25 x = 106.87º o...
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[ -0.055419921875, 0.050048828125, -0.0242919921875, 0.0478515625, -0.016845703125, 0.001983642578125, -0.017822265625, -0.0093994140625, 0.00885009765625, -0.033447265625, 0.0869140625, -0.0206298828125, 0.005767822265625, 0.03759765625, 0.03271484375, -0.07080078125, -0.06494140625, ...
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Applications of general arrow notation? December 7th 2006, 03:50 PM #1 Applications of general arrow notation? I don't know where to put this, so I put it here cause it is so advanced... Anyway, for those who knows what arrow notation is, I have some questions, and for those who don't know what it is, here's...
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2 calculus quesions April 17th 2010, 07:32 AM #1 Member Joined Dec 2009 Posts 171 2 calculus quesions Hey there, I'll be glad to get some help in the following questions: 1. Let g(x) be a differentiable function at $(0,1]$ which satisfies: $x^{2}g(x)$ is a monotonic ascending function at $(...
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Strange question with improper integrals April 29th 2010, 06:49 PM #1 Member Joined Oct 2009 Posts 229 Strange question with improper integrals First off, the limits of integration are both infinites, and I've only worked with one so far, with the other being a number. What changes? And finally...
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Interesting problem, any proofs? October 30th 2009, 10:00 AM #1 Member Joined Mar 2009 Posts 168 Interesting problem, any proofs? Let $x_{1},x_{2},...,x_{n}$ be positive real numbers. Prove that $n^2\leq(x_1+x_2+...+x_n)(\frac{1}{x_1}+\frac{1}{x_ 2}+...+\frac{1}{x_n})$ and $\frac{x_1+x_2+...+x_...
5
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Finding a matrix and its transpose from a given matrix August 4th 2007, 11:23 PM #1 Newbie Joined Aug 2007 Posts 9 Hi all, I'm new here. I'm currently doing a thesis on image compression and embedding. However, I'm stuck at a final part of my calculations. Lets say you have a square matrix A. Taking t...
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Related Rates cont'd... November 21st 2008, 09:07 PM nivek516 Related Rates cont'd... I have some more questions that I need help setting up. Please feel free to switch out the numbers for variables so I can learn how to solve these. Thanks in advance for your help! Quote: Two towers (A and B) are 150...
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[ -0.0037689208984375, 0.031982421875, 0.0213623046875, -0.048583984375, -0.01904296875, -0.0206298828125, -0.052978515625, 0.0673828125, -0.0439453125, 0.0167236328125, 0.0164794921875, -0.05078125, 0.0223388671875, 0.006072998046875, 0.00506591796875, 0.12158203125, -0.068359375, 0...
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Related Rates: Changing Dimensions in a Rectangle November 16th 2009, 08:03 PM #1 Newbie Joined Nov 2009 Posts 1 Related Rates: Changing Dimensions in a Rectangle I am so confused on this one. I don't know if I'm suppose to use implicit differentiation like my other problems or what. Problem: The le...
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sin (180 - c) = sin c how ? April 1st 2011, 06:51 AM #1 Junior Member Joined Jul 2009 Posts 68 i was going through an example in my book and cam across a step a + b + c = 180 a+ b+ = 180 - c sin ( a + b) = sin (180 - c) = sin c i am not being able to understand how sin (180 - c) = sin...
4
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Math Help February 24th 2007, 10:10 AM #1 Newbie Joined Feb 2007 Posts 5 Loan James borrowed $5,000 from his friend 2 years ago; and, an additional $3,000 1 year ago. He wants to repay his friend the money that he borrowed plus interest at 8% compounded quarterly. a) How much will James have to pay...
5
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Multivariable Calculus - Chain Rule March 16th 2010, 03:12 PM #1 Junior Member Joined Sep 2009 Posts 32 Multivariable Calculus - Chain Rule I might have to keep coming back here, this assignment is killing me... Given w = xy + yz, y = sin x and z = e^x, find dw/dx $\frac{dw}{dx} = \frac{\partial...
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A Circle Circumscribed about a hexagon January 12th 2010, 05:30 AM #1 Newbie Joined Jan 2010 Posts 4 A Circle Circumscribed about a hexagon i need your help again ! help me to solve this...please God bless you more . *A circle is circumscribed about a hexagon. The area outside the hexagon b...
4
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Propositional Logic Proof June 16th 2011, 06:03 AM #1 Senior Member Joined Dec 2008 Posts 288 Propositional Logic Proof I was wondering if this proof was ok or if (as I suspect) I am wrong and if you could help point me in the right direction. thanks for any help Suppose that $\mathcal{F}$ is a...
5
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Quadratic Functions... and... ranges? November 29th 2009, 07:23 AM #1 Newbie Joined Oct 2009 Posts 24 Quadratic Functions... and... ranges? Forgive me if this is in the wrong place. I'm at that transitional stage where the algebra stuff is mix in with the pre-calculus stuff. The question: Elect...
4
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asking if this squeeze theorem proof is correct January 27th 2011, 12:07 AM #1 Junior Member Joined Jul 2008 From Athens, Greece Posts 48 Hello, I would like to ask if the proof below, concerning the squeeze theorem is correct. I guess someone else must have come up with it but I didn't find anyt...
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What is Double Sampling? 6. Process or Product Monitoring and Control 6.2. Test Product for Acceptability: Lot Acceptance Sampling 6.2.4. What is Double Sampling? Double Sampling Plans How double Double and multiple sampling plans were invented to give a questionable lot another chance. For examp...
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[ -0.0673828125, 0.0390625, 0.0419921875, -0.0546875, 0.0194091796875, -0.0751953125, 0.040771484375, 0.12109375, 0.0189208984375, 0.03271484375, -0.0306396484375, 0.01068115234375, 0.07763671875, -0.08203125, 0.0556640625, -0.01239013671875, 0.0093994140625, -0.022705078125, -0.06...
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Precalculus/Trigonometry Posted by Amanda on Saturday, October 27, 2007 at 1:14am. How can I write a polynomial equation for this problem and draw a labeled diagram? A developer wants to build homes on a rectangular plot of land 4 kilometers long and 3 kilometers wide. In this part of the city, regulations require a ...
4
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slope of hill August 17th 2008, 09:28 PM #1 Newbie Joined Apr 2008 Posts 23 slope of hill The height of a certain hill (in meters) is given by h(x,y) = 10 ( 2x y - 3 x^2- 4 y^2- 18 x + 28 y + 12), where y is the distance (in kilometers) North, x the distance East (a) How steep is th...
4
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Homework Help Posted by Urgent on Friday, March 30, 2007 at 2:30pm. I have a test soon.. and I really need to know how to do this problem.. please help!!! lim as x-->0 sin^2(x)/tan(x^2) the answer is 1, but I have no clue how to get that! Use series expansions. Look up Taylor expansion on google and study that topi...
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Riemann's Hypothesis December 22nd 2009, 03:53 PM Vitruvian Riemann's Hypothesis Today I was speaking to a friend of mine, and he brought up something called Riemann's Hypothesis. He told me that it was a concept relating to the distribution of primes and has yet to be proven, and is evidently somehow relate...
4
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Find number of periods from annuity formula August 22nd 2011, 05:20 AM #1 Member Joined Jan 2009 From Punjab, Pakistan Posts 88 Find number of periods from annuity formula I have attempted to separate the number of periods (n) from the following equation pv (1 + i)^n + pmt (1 + i * type) [{(1 + ...
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Calculator for confidence intervals Calculator for confidence intervals of relative risk This calculator works off-line. (IE4) Programme written by DJR Hutchon. Enter data into the boxes "A","B","C",and "D" ┌───────┬──────────────────────┬─────────────────────┐ │ │ │Group characteristic │ ...
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Implicit Line Finding? June 14th 2009, 10:50 AM #1 Implicit Line Finding? Find the equation of the line(s) tangent to the curve $x^3+2xy-y^2=-2$ at the point(s) where $x=1$. My answer is $y=-\frac{3}{4}x+\frac{15}{4}$ and $y=-\frac{5}{4}x+\frac{1}{4}$. Is this correct? It would be be...
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problem solving on function! August 27th 2009, 12:02 PM #1 Newbie Joined Aug 2009 Posts 9 Pollution control has become a very important concern in all countries. If controls are not put in place, it has been predicted that the function P=10000t^5/4 + 14000 will describe the average pollution, in parti...
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Some simple logarithm questions May 29th 2009, 01:03 PM #1 Junior Member Joined Oct 2007 Posts 55 Some simple logarithm questions the book simply says find the exact value of each expression. without a calculator. using properties of logarithms.( which it lists, but I can't see where they apply) 1. l...
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finding a specific operator January 13th 2012, 07:21 PM Zeke finding a specific operator Hi! I am kinda going mad trying to find the following operator. Here goes the problem: Let $(z_n)$ be a complex seq. such that $\lim z_n=0$ and let $(x_n)$ be a seq. of pos. numbers such that $\ lim x_n=\infty$. Show tha...
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calculus ab word problem January 8th 2009, 01:31 PM #1 Junior Member Joined Dec 2008 Posts 37 At time t, t is greater than or equal to 0, the volume of a sphere is increasing at a rate proportional to the reciprocal of its radius. At t=0, the radius of the sphere is 1 and at t=15 he radius is 2 (the v...
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parametric equation on line in 3d February 20th 2007, 08:16 PM #1 Junior Member Joined Feb 2007 Posts 44 parametric equation on line in 3d find parametric equation for the line with the following properties. the lines passes through the origin, it is contained in the plane 2x+3y-z=0. and is orthogonal to...
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Homework Help Posted by K on Friday, November 30, 2007 at 1:36am. Initial info: The atoms of crystalline solid pack together into a three-dimensional array of many small repeating units called unit cells. The simplest of the unit cells are those that have cubic symmetry, with atoms positioned at the corners of a cube...
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Please help with Using Period to Evaluate Sin and Cosine July 3rd 2005, 07:14 PM #1 Junior Member Joined Jun 2005 Posts 43 Please help with Using Period to Evaluate Sin and Cosine Hi, I am trying to follow the logic of tis problem and the solution. cos (- 7pi/2) = cos(-4pi + pi/2) = cos pi/2 = 0. ...
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Posts by Total # Posts: 26,863 math first day he ran 1.5 2nd day he ran 1.5(1.1) 3rd day he ran 1.5(1.1)(1.1) = 1.5(1.1)^2 .. on the 7th day he ran 1.5(1.1)^6 so we have: 1.5 + 1.5(1.1)+ 1.5(1.1^2 + ... + 1.5(1.1)^6 which is a geometric series whose sum is 1.5( 1.1^7 - 1)/(1.1 - 1) = 1.5(.9487171)/.1 = 14.230756... ...
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An Asymmetric Proximal Decomposition Method for Convex Programming with Linearly Coupling Constraints Advances in Operations Research Volume 2012 (2012), Article ID 281396, 20 pages http://dx.doi.org/10.1155/2012/281396 Research Article An Asymmetric Proximal Decomposition Method for Convex Programming with Linearly...
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Rigid Body Trajectories in Different 6D Spaces ISRN Mathematical Physics VolumeΒ 2012Β (2012), Article IDΒ 467520, 21 pages http://dx.doi.org/10.5402/2012/467520 Research Article Rigid Body Trajectories in Different 6D Spaces ^1School of Systems Engineering, University of Reading, Reading RG6 6AY, UK ^2Department of...
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Product of Linear Operators - A basic quesiton October 10th 2009, 11:53 PM aman_cc Product of Linear Operators - A basic quesiton Let $T_1, T_2,....T_n$ be linear operators on a vector space V. Let $v\in V$ such that one of $T_1(v),T_2(v),..,T_n(v)$ is 0. Is it ok to say $T_1T_2....T_n(V)=0$? October ...
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5. The Ellipse Why study ellipses? Orbiting satellites (including the earth and the moon) trace out elliptical paths. Many buildings and bridges use the ellipse as a pleasing (and strong) shape. One property of ellipses is that a sound (or any radiation) beginning in one focus of the ellipse will be reflected so it...
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Summations help! February 15th 2011, 07:15 AM collegestudent321 Summations help! Hello, I am trying to solve a summation but i keep getting the wrong answer: summation of 2^i from i=0 to i=h/2 I have tried using the geometric series equation and have gotten:(2^((h/2)+1) - 1) / (2-1) which simplifie...
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Shtetl-Optimized Monday, June 30th, 2008 This post will be longer and more technical than most — but what can I say? Sometimes you need to get something technical off your chest. The topic is something my student, Andy Drucker, and I (along with several interested others) have been thinking about on and off for months...
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Differential equation system (Please HELP) May 26th 2010, 02:43 PM #1 Newbie Joined May 2010 Posts 3 Differential equation system (Please HELP) Hi In few hours I got an exam in Differential equations 1 really need help with these to differential equation systems (I am not sure how to solve them...
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Normal Subgroups and Factor Groups April 22nd 2009, 03:44 PM #1 Junior Member Joined Apr 2009 Posts 26 Normal Subgroups and Factor Groups Let G = GL(2,R) and let K be a subgroup of R*. Prove that H = {A ∈ G| det A ∈ K} is a normal subgroup of G. Normal A subgroup $H\leq G$ is said to be normal iff ...
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trig problem April 15th 2013, 03:53 PM mcleod86 trig problem Hi, i have just started a tafe course and have come across this problem. I have not taken trig in along time, any guidance would be appreciated. question. 6. How do you find the length of the baseline AD when it is interrupted by an obstacle?...
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Topology question: continuous maps and homeomorphisms April 18th 2011, 12:26 AM #1 Junior Member Joined Aug 2009 Posts 36 Topology question: continuous maps and homeomorphisms Let R denote the real numbers. Let S^2 denote the unit sphere in R^3 Let f: S^2 -> R^4 be defined by f(x,y,z)=(x^2-y^2,xy...
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Cauchy sequences October 26th 2008, 01:34 AM terr13 Cauchy sequences Suppose $x_n$ is a Cauchy sequence in a metric spare X, and some subsequence $x_k$ converges to a point $p \in X$. Show the full series converges to p. Is this correct? First prove convergence of $x_n$. Find an integer N such that $\f...
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yet another trig substitution February 12th 2009, 07:48 PM mollymcf2009 yet another trig substitution Last one on this homework!!! $\int \frac{\sqrt{x^2-100}}{x^3}dx$ Here is where I have gotten to: *I left out the first 10 steps I did, let me know if you wanna see all those. $\frac{1}{100} \i...
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Conditional probability. March 31st 2011, 11:59 PM #1 Newbie Joined Mar 2011 Posts 3 Conditional probability. Hey guys, I'm having trouble with figuring this out: What is P(V) given the following information? P(F|V) = 0.02, P(F^c|V) = 0.98 P(F|V^c) = 0.4, P(F) = 0.2, P(F^c) = 0.8 Where I'v...
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Stuck on finding an Integral Hi all, I am stuck on trying to find $\int sin(2x+\frac{\pi}{4})cos(2x+\frac{\pi}{4})dx$ Have you considered $\sin(2x) = 2\cdot\sin(x)\cos(x)$? Mustn't forget one's trigonometry. Try u substitution, with $u=sin(2x+\pi/4)$. Then $du=2cos(2x+\pi/4)$, and the rest is easy. Not sure how I wo...
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Prey/Predator Model (need help asap please) November 2nd 2008, 03:10 PM #1 Junior Member Joined Mar 2007 Posts 33 Prey/Predator Model (need help asap please) Hey I need help with a question regarding a prey/predator model. The question is in 2 parts (paraphrasing them). (i) if there are no predators, wha...
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Algebraic Division October 20th 2008, 01:04 PM db5vry Algebraic Division I need serious help with this, I can't understand it at all: If I had, for example, x³ + 4x² + 5x + 2 and had to divide it by (x+2) How would I do it? Can you please go through a method with me to solve this? It would be grea...
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Set y = 0? October 2nd 2009, 06:29 AM tsmith Set y = 0? The question first tells me to graph the function to determine any x-intercepts. y = 20(2/X+1 - 3/x) When I put it in my calculator, I got x-intercept = (1,0) Now it tells me to set y = 0 to confirm this result. So, 0 = 20(2/X+1 - 3/x) ...
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Find the center the length of the axes and eccentricity of ellipse. Find the center the length of the axes and eccentricity of ellipse. $2x^2+3y^2-4x-12y+13=0$ Hi - Complete the square for x: $2x^2 - 4x = 2(x^2 - 2x)$ $=2((x-1)^2-1)$ $=2(x-1)^2-2$ and for y: $3y^2-12y =3(y^2-4y)$ $=3((y-2)^2-4)$ $=3(y-2)^2-12$ So the ...
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A probability exercise on the Bernoulli distribution July 18, 2009 By Todos Logos What is the probability, flipping a coin 8 times, to obtain the sequence HHTTTHTT? (H = head; T= tail) The theory teaches us that to solve this question, we can simply use the following formula: $$f(x)=P(X=x)=B(n,p)=\begin{pmatrix}n\...
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An Introduction to Tuning and Temperament In this post, I will explain some different tuning systems and their advantages and disadvantages. First, let’s see what the basic goals are of tuning systems. 1. There should be 12 notes per octave, in half-step intervals. 2. An octave (12 half steps) should be at a ratio o...
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Easy integral? $(e^{\cos(x)} \sin( \sin(x) ))'=-\sin x \,e^{\cos x}\sin(\sin x)+e^{\cos x}\cos(\sin x) \cos x$$=e^{\cos x}\left(\cos(\sin x)\cos x-\sin x\,\sin(\sin x)\right)=$... $e^{\cos x}\cos(x+\sin x)$ !! Oh, dear hollie mollie: yes, it is! A question: how did you come up with it? Some program or some insight? Ton...
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Are hollow pipes less likely to bend under weight enigma What you may have heard is this, Nicholas: Between a solid pipe and a hollow pipe of the same weight, the hollow pipe will be more resistant to bending. It will also have a much larger radius. From the equations already presented above, the maximum bending m...
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temperature problem August 3rd 2011, 03:09 PM #1 temperature problem Problem Statement The temperature, $T$, of a cooling fin of a finite length, $L$, satisfies $\frac{d^2T}{dx^2} = -k^2\left( T_L-T \right),\quad 0\leq x\leqL,\quad T(0) = 0,\quad T(L) = T_L$ where $k$, $T_0$, and $T_L$ are constants ...
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Quick trig problem February 14th 2010, 07:09 AM #1 Newbie Joined Feb 2010 Posts 23 Quick trig problem Truth is, I haven't simplified trig problems in a while. I was wondering if you guys could help me out. Here's the problem: Write the trigonometric expression in terms of sine and cosine, and t...
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12. The Binomial Probability Distribution A binomial experiment is one that possesses the following properties: Later, on this page... 1. The experiment consists of n repeated trials; 2. Each trial results in an outcome that may be classified as a success or a failure (hence the name, binomial); 3. The probabil...
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Bernoulli's Equation September 5th 2011, 06:33 AM #1 Junior Member Joined Jul 2009 Posts 59 Bernoulli's Equation What did I do wrong here? $\frac{dy}{dx} + \frac{2}{x}y = y^2$ $\Rightarrow (-1)y'y^{-2}+(-1)y^{-1}$ $\Rightarrow (-1)y^{-2}y'+(-1)y^{-1}=-1$ $\Rightarrow y^{-2}y'+y^{-1}=1...
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