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tkhunny
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tkhunny
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Join Date
04-12-2005
Last Activity
Yesterday
09:02 PM
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Yesterday,
04:30 PM
tkhunny
replied to a thread
Smoothing function between 2 constants with a variable
in
Calculus
Sigmoid might do it. Logistic might be more natural. I once used a least-squares Inverse Tangent for some runoff data related to death claims in a...
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4 replies | 68 view(s)
Yesterday,
04:14 PM
tkhunny
replied to a thread
how to map a group of numbers into odds/probability?
in
Probability / Statistics
Well, you should see immediately one problem. For your Speed = 1, you have Book = 7.2, 4.9, and 17 -- Not a real clear relationship, there. ...
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1 replies | 33 view(s)
Yesterday,
04:05 PM
tkhunny
replied to a thread
Help with finding first level derivative of y = x^2 * 2^x^2
in
Calculus
Too bad we don't much like imgur links, in here. No sure how to help if we can't see the actual problem statement.
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4 replies | 108 view(s)
12-16-2018,
06:32 PM
tkhunny
replied to a thread
Help with finding first level derivative of y = x^2 * 2^x^2
in
Calculus
Just to be clear, we're talking about this...? y = 2^{x}\cdot 2^{x^{2}} If so, this will take a whole lot more effort. Have you met: *...
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4 replies | 108 view(s)
12-15-2018,
05:20 PM
tkhunny
replied to a thread
The cost of admission to a exhibition for an adult is 3 times the cost of a child....
in
Arithmetic
Rule #1 If you don't know what it is, give it a name so we can talk about it. A = Cost of Adult Ticket Y = Cost of Youth ticket C = Cost of...
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4 replies | 180 view(s)
12-15-2018,
10:23 AM
tkhunny
replied to a thread
Structures: "List the topics covered in structures maths lessons..."
in
Geometry and Trig
Structures Math Statics? Strength of Materials? Really an engineering course?
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7 replies | 245 view(s)
12-15-2018,
10:22 AM
tkhunny
replied to a thread
Linear Problem: A biologist wants to prepare a special diet for the animals.
in
Intermediate/Advanced Algebra
That's no good. Are you in the right class? I blame your teacher. It's an online course, isn't it?!
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4 replies | 163 view(s)
12-14-2018,
09:59 PM
tkhunny
replied to a thread
Linear Problem: A biologist wants to prepare a special diet for the animals.
in
Intermediate/Advanced Algebra
That's a very nice problem statement. What's your plan? Typically, you would find some things that are equivalent. Protein from A + Protein...
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4 replies | 163 view(s)
12-14-2018,
09:56 PM
tkhunny
replied to a thread
What is the primitive / anti-derivative of x^x ?
in
Calculus
Do you have reason to believe there is a simple answer to this? You may need a series solution. Why are we asking?
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2 replies | 130 view(s)
12-14-2018,
03:45 PM
tkhunny
replied to a thread
Logic Question
in
Advanced Math
In the programming world, someone must decide what to do when a program encounters 0/0. In some languages, 0/0 = 1, by default. If you do not want...
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16 replies | 413 view(s)
12-14-2018,
03:34 PM
tkhunny
replied to a thread
please help to solve -- multiply by 2 or divide by 3 - 60 times
in
Arithmetic
That's the spirit. Don't let the monkey play with the calculator.
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12 replies | 343 view(s)
12-14-2018,
03:32 PM
tkhunny
replied to a thread
Number of accidents follows the Poisson distribution w/ rate of 0.5 car accidents/day
in
Probability / Statistics
I'm not quite following your work. It may be okay, I suppose, but once you said "Negative Binomial", I lost interest. In my opinion, there real...
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1 replies | 194 view(s)
12-14-2018,
03:25 PM
tkhunny
replied to a thread
Sell price based on desired profit: X = sell price B = buy price A = amt invested in
in
Finance/Business Math
I'm not real clear on what it i you are trying to do. Can you provide one of those worked out examples?
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2 replies | 130 view(s)
12-13-2018,
08:06 PM
tkhunny
replied to a thread
please help to solve -- multiply by 2 or divide by 3 - 60 times
in
Arithmetic
Given the prime factorization, it is rather simple to determine the minimum number of monkey calculations to get there from 12. 60 is an even...
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12 replies | 343 view(s)
12-13-2018,
08:03 PM
tkhunny
replied to a thread
Calculation: if it takes 45 seconds to process a widget, how many in 1 hour?
in
Arithmetic
Any idea how to proceed? How many seconds in one hour?
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2 replies | 109 view(s)
12-13-2018,
01:08 PM
tkhunny
replied to a thread
please help to solve -- multiply by 2 or divide by 3 - 60 times
in
Arithmetic
Have you considered the prime factorization of each?
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12 replies | 343 view(s)
12-11-2018,
01:21 PM
tkhunny
replied to a thread
Problem 3
in
Intermediate/Advanced Algebra
Do you understand the Domain given? Is it continuous? How many points have you plotted in your attempt to solve this?
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2 replies | 196 view(s)
12-11-2018,
01:19 PM
tkhunny
replied to a thread
Problem 2
in
Intermediate/Advanced Algebra
Please share with us the definition of a "75th percentile".
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1 replies | 178 view(s)
12-11-2018,
10:29 AM
tkhunny
replied to a thread
Surd Problem
in
Intermediate/Advanced Algebra
Thought Question: Did you notice that 1 -\sqrt{3} < 0? Please read my signature. This may be the problem. \dfrac{4-2\sqrt{3}}{\sqrt{3}} =...
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15 replies | 425 view(s)
12-10-2018,
05:59 PM
tkhunny
replied to a thread
Polynomial Formula
in
Intermediate/Advanced Algebra
Looks to me like you have the idea. I'll abuse the parameters a bit. Degree 4 f(x) = ax^4 + bx^3 + cx^2 + dx + e a zero at x=2 f(x) =...
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6 replies | 267 view(s)
12-09-2018,
09:12 PM
tkhunny
replied to a thread
Vectors Problem: wheelchair on a ramp inclined at an angle of 20 degrees
in
Geometry and Trig
1) Don't use imgur. We officially hate all those ads. 2) Maybe the book meant 200N?
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1 replies | 56 view(s)
12-09-2018,
09:01 PM
tkhunny
replied to a thread
Need help with an integral
in
Calculus
Welcome to the real world. You have encountered an Elliptic Integral. Numerical evaluation? Series approximation? What are your alternatives?
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3 replies | 196 view(s)
12-07-2018,
05:59 PM
tkhunny
replied to a thread
Hard Inverse function f(x) problem
in
Intermediate/Advanced Algebra
You should derive it at least once in your mathematics career. f(h(x)) = x - Definition of Inverse \dfrac{d}{dx}\;f(h(x)) = \dfrac{d}{dx}\;x -...
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15 replies | 511 view(s)
12-07-2018,
10:30 AM
tkhunny
replied to a thread
Simple Integral "Find what's wrong" question
in
Calculus
Fair enough, the dx is not TOTALLY irrelevant, but There is NO difference: \int\;f(x)\;dx = \int\;dx\;f(x) = \int\;f(x) The context must be...
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7 replies | 384 view(s)
12-06-2018,
10:23 PM
tkhunny
replied to a thread
Simple Integral "Find what's wrong" question
in
Calculus
"dx" is superfluous, anyway, so long as the context is clear. Why do you suppose there is anything "wrong" with it? Really, though, just check...
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7 replies | 384 view(s)
12-06-2018,
10:21 PM
tkhunny
replied to a thread
Showing that X1+X2=2X1 for random variable X1, X2 such that X1=X2
in
Probability / Statistics
Can you write out the definition of E? That should get you started.
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4 replies | 354 view(s)
12-06-2018,
10:17 PM
tkhunny
replied to a thread
Indefinite Integral Polynomial in Denominator: integrate (2x/(x^2 + 6x + 13)) dx
in
Calculus
^{2} + A^{2} typically, substitute f(x) = A*tan(u) ^{2} - A^{2} typically, substitute f(x) = A*sin(u) ^{2} typically, substitute f(x) =...
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7 replies | 369 view(s)
12-06-2018,
05:55 PM
tkhunny
replied to a thread
Precise Definition of a: f(x)=x^2, L=49, c=-7, epsilon=0.4
in
Calculus
Perhaps spend some more time on the Absolute Values and the Squares. Is x < 0, potentially?
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2 replies | 318 view(s)
12-06-2018,
05:52 PM
tkhunny
replied to a thread
Showing that X1+X2=2X1 for random variable X1, X2 such that X1=X2
in
Probability / Statistics
Just Mean and Variance? Do you mean IDENTICAL, or just the first two moments?
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4 replies | 354 view(s)
12-06-2018,
10:21 AM
tkhunny
replied to a thread
Working out a percentage: What grade do I need in the second part?
in
Arithmetic
\dfrac{Total\;Earned\;(Add\;up\;everything)}{Total\;Possible\;(Add\;up\;everything)}
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3 replies | 345 view(s)
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About tkhunny
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About tkhunny
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Actuary
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"Unique Answers Don't Care How You Find Them." - Many may have said it, but I hear it most from me.
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