| Subject | Date Asked |
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| Simultaneous differential equations | 7/15/2009 |
Q: Respected Sir, I'm currently pursuing a project on the cycle times of mist flow to a Nutrient mist ...
A: Sorry for my delay. I tried to get my CAS (computer algebra system), Maple 12, to solve your system ...
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| Differential equation | 7/10/2009 |
Q: An underground storage tank is being filled with liquid as shown in the diagram.Initially the tank ...
A: dV/dt=20-k*h^2, based on the info given in the problem. However, V=(4/3)h^3, thus, ...
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| Differential Equation, Solutions | 6/6/2009 |
Q: 1.Determine the singular points of the given differential equation, then classify each singular ...
A: 1. Re-written as: y'' + (x^2-1)/(x^2(x+1)) y' - y/(x^2(x+1)) = 0 . Singular points where ...
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| Maths2 | 5/31/2009 |
Q: solve the initial vale second order homogeneous linear differential equation: y"-4y'+4y=0 ...
A: Let y=e^(rx), so we get the characteristic equation: r^2-4r+4=0 ==> (r-2)(r-2)=0 ==> r=2,2 Repeated ...
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| integrate eq | 1/5/2009 |
Q: bs'd, What's the generic expression(primitive) resulted from the integration of the following ...
A: Wow, that's a tough one! Let me just make sure, the problem is: Integrate[dx/(e^(-k1*x)+k2*x+k3)] - ...
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| differential equations | 9/2/2008 |
Q: a) 1/ax-1+1/bx-1=a-b, solve for x? thank you
A: I gather the ax & bx are denominators... Let's first multiply by the LCD, which is a*b*x...so we ...
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| Need help in differential equation | 7/22/2008 |
Q: Could you please help me in solving this equation? x"' - x' = e^t. Thanks
A: First solve the corresponding homogeneous DE: x'''-x'=0 Let x(t)=e^(rt) ==> x'=r*e^(rt), ...
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| Simultaneous differential equations | 7/21/2008 |
Q: Could you please help me with this problem: (dx/x^2)+y^2 = dy/2xy = dz/(x+y)^3 *z
A: I just want to check... (dx/x^2)+y^2 = dy/2xy = dz/(x+y)^3 *z Is (dx/x^2)+y^2 correct? Should it be ...
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| families of curves | 7/13/2008 |
Q: How can i find the general solution in differential equation 1. circle with centers on the x axis. ...
A: I am a bit confused by your question. Question #1 has nothing to do with a "differential equation" ...
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| popuation problem | 7/10/2008 |
Q: I am having difficulty interpreting the notation of an equation. For the equation 1/P(dP/dt)=at+b I ...
A: Remember to include a constant of integration...so you should have obtained: ln P = [(at^2)/2]+ bt ...
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| career counselling | 5/24/2008 |
Q: scope, prospects, and future of having msc (masters in mathematics & statistics). where can i aplly ...
A: Check these sites: http://www.ams.org/careers/ http://www.ams.org/employment ...
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| can you help me please | 1/15/2008 |
Q: i have a question x^3dy/dx+2x^2y=5 find the general solution of the differential equation find the ...
A: (x^3)y'+2(x^2)y=5, dividing by x^3: ==> y'+(2/x)y=5/x^3, which is a first-order, linear ODE, we can ...
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| differential equation | 1/10/2008 |
Q: Q: solve 1/2y+1*dy/dx=cos*x/sin*x, y(pi/4)=1/2 thanks
A: So, the DE is: (1/2)y+y'=cos(x)/sin(x) with y(pi/4)=1/2...yes? ==> y'+(1/2)y=cos(x)/sin(x), is a ...
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| problem differential equation | 1/9/2008 |
Q: the height, h of a type of tree increase proportionately to the differenciate between its height at ...
A: Let h'(t)=dh/dt, thus... h' is proportional to H-h ==> h'=k(H-h), where k=the constant of ...
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| rational expressions | 1/8/2008 |
Q: How is doing operations (adding, subtracting, multiplying, and dividing) with rational expressions ...
A: Indeed knowing how to do arithmetic with rational numbers helps understanding the arithmetic with ...
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| help with math | 1/5/2008 |
Q: first of all I just wanted to know if the Fibonacii Sequence is a function? I was thinking that it ...
A: Yes, the Function F(n), defined as the nth Fibonacci #, is a function...since there is only one ...
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| Complicated differential equation | 6/6/2007 |
Q: I have a pretty complicated differential equation question related to an experiment that I am ...
A: Wow, I just found this question of yours from the summer! I had "been on vacation" from AllExperts ...
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| Please help in laplace transform.. | 5/31/2007 |
Q: Find: L{(3t+1)u(t-3)} ANSWER: e^(-3s)*(10s+3)/s^2 ---------- FOLLOW-UP ----------Please provide me ...
A: L{(3t+1)u(t-3)} =integral((3t+1)u(t-3)e^(-st),t=0..infinity) =integral((3t+1)e^(-st),t=3..infinity) ...
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| is it unsolvable? | 5/27/2007 |
Q: Could please solve the following. There exists a distinct possiblility that there has been a ...
A: Well, it is a first-order linear ODE...so the integrating factor is: e^(-sin(x)), which gives [y ...
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| Mixing Problem Help | 1/11/2007 |
Q: a 30 gallon tank initially contains 15 gallons of salt water containing 6 lbs of salt. Suppose salt ...
A: Let A(t)=the amount of salt (in lbs) in the tank @ time 't' Since, dA/dt=(rate in)-(rate out), we ...
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| lmits | 1/4/2007 |
Q: I am now working throuhg my text book and i am stuck on trying to understand the absolute value ...
A: Let's look at it this way: (x-4)^3/|4-x| = (x-4)^2 (x-4)/|4-x| = (x-4)^2 (x-4)/|x-4|, since ...
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| mixing problem involving 3 inlets and 2 outlet pipes | 8/6/2006 |
Q: how do we solve a mixing problem involving 3 inlets and 2 outlet pipes? here's the problem: ...
A: The volume, V(t)=500+18t-6t=500+12t gal, where t is in minutes Let x(t) = the amount of salt, in ...
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| error function | 6/3/2006 |
Q: hai , i have been trying hard for integrating a complicated function ..between the limits ...
A: I am not all that familiar with Mathematica, I am a Maple user. Perhaps if you give me the ...
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| functions on a graph | 5/31/2006 |
Q: Is there a place on the internet where we could read about functions on a graph? I am trying to ...
A: Sure, there are MANY resources on the net! Try: http://www.purplemath.com/modules/fcns.htm ...
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| conversions 1/5th,1/20th,and 1/25th troy oz to decimal troy oz weight | 5/27/2006 |
Q: I'm trying to figure out how to convert 1/5th troy oz., 1/20th troy oz. and 1/25th troy oz. to a ...
A: Do you mean you want to convert 1/5 to 0.2, 1/20 to 0.05, and 1/25 to 0.04? Or you want to convert ...
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| integration | 5/22/2006 |
Q: all the All Expert calculus tutors seem to be on vacation. I hope you don't mind me asking you the ...
A: 1. Yes, that integral is "improper" - since the interval -- contains x=0, where 10/x^3 is ...
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| calc applied minimums and maximums | 1/4/2006 |
Q: A steel pipe is carried down a hallway 9 ft wide. At the end of the hall there is a right -angled ...
A: Since it is easier to explain this with a diagram, I found a site that explain it well. It even has ...
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| graphical equations. | 12/27/2005 |
Q: Student has resources of FlashMX 31 hours,DreamweaverMX 22 hours & Photoshop 14 hours.He can produce ...
A: Well, it is rather difficult to show you graphically here. Here are some websites that have similar ...
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| can this one be solved? | 9/10/2005 |
Q: For the basic equation A(200) + B(400) = 12000 Can 2 sets of solutions be found for A and B, in ...
A: Yes, if we can use any real numbers then there are infinitely many answers to it! Perhaps you mean ...
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| linear functions | 9/2/2005 |
Q: a table of values is given for the linear function f(x)=mx+b. determine m and b. X f(x) 1 ...
A: First find the slope (only 2 points are needed, not 3 as given). m=(change in y)/(change in x), ...
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| math | 7/26/2005 |
Q: how much water can be held by a cylindrical tank with a radius of 12 feet and a height of 30 feet? ...
A: I'll answer your questions, but they are not related to Differential Equations. In the future, ...
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| tangents | 7/17/2005 |
Q: I am a mathematics teacher currently guiding 17 year olds. Recently I came across an unfamiliar ...
A: I gather you mean the parabola: y=3+2x-x^2, yes? If so, then they want the two different equations ...
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| Vector Analysis | 5/24/2005 |
Q: In one of the problems in my calculus book, I am asked to prove that: div(FxG)=(curl F)•G-F•(curl G) ...
A: Sorry for my delayed reply. Your work looks good until step 2...how did you get that?? Let's look ...
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| Quick question...probably easy. :) | 1/21/2005 |
Q: I am a novelist, and I am working on a project for young adults. I am hoping you might be able to ...
A: Glad you are asking this, to make the story mathematically correct! :-) Well, the standard ...
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| Sequence | 1/13/2005 |
Q: For starters, this is not a homework question. I am not even in a Math class. Someone just asked me ...
A: Wow, questions like these can be quite tricky, since there can be many different answers depending ...
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| solving cubics using matrices | 1/4/2004 |
Q: i have an algebra project that asks me to find a manufactured curve (i choose a french curve ...
A: Well, Since a cubic is of the form: f(x)=ax^3+bx^2+cx+d has 4 variables (a, b, c, and d), and you ...
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| growth and decay | 7/28/2003 |
Q: A farmer starts out with 10 rabbits. The population was growing at an instaneous rate of 20% per ...
A: Let P(t)=the rabbit population t months after the start. P'=0.20P +2 -3 (the +2 is for those 2 ...
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| Triangles | 7/1/2003 |
Q: I know your profile doesn't say anything about geometry, but all the geometry experts are on ...
A: Sorry for my delay. What you have is a standard 45-45-90 right triangle, whose sides are in the ...
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