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tkhunny
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tkhunny
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04-12-2005
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11:28 AM
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Today,
11:17 AM
tkhunny
replied to a thread
non homogeneous general solution
in
Differential Equations
In order for anyone to check your work, you will have to show some work. Just dropping your final answer doesn't help anyone. What methods did...
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1 replies | 13 view(s)
Yesterday,
08:58 PM
tkhunny
replied to a thread
Finding the x-intercept of f(x) = x + cos(x)
in
Calculus
No, I think you have it. There are many interesting methods for finding numerical solutions where your algebraic efforts prove insufficient. Some...
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1 replies | 46 view(s)
12-09-2017,
12:09 AM
tkhunny
replied to a thread
Need Help with this Implicit differentiation problem!!
in
Calculus
I think I can tell you what is going wrong. 1) You have too much faith in the answers in they book. They are created by humans. They are...
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2 replies | 85 view(s)
12-09-2017,
12:03 AM
tkhunny
replied to a thread
Help with a quiz.
in
Arithmetic
It's not clear to me what is wanted. You say there are six numbers, then you speak of "0" and "above 6", which are not in the set of numbers you...
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5 replies | 196 view(s)
12-08-2017,
12:31 PM
tkhunny
replied to a thread
SAT Math Q: If ax+4=2y+8, bx+2=4y-11, & a=3-b, then which is true?
in
Intermediate/Advanced Algebra
The methods you suggested should work just fine. Please demonstrate your efforts. You are given a = 3 - b. Why not substitute that and cut down...
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2 replies | 74 view(s)
12-08-2017,
07:14 AM
tkhunny
replied to a thread
Show that λ is an eigenvalue of the B matrix iff λ is an eigenvalue of B'
in
Calculus
Pick any 2x2 matrix and play with it a bit. Expand your exploration from there.
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5 replies | 242 view(s)
12-07-2017,
05:42 PM
tkhunny
replied to a thread
Question about Vertical Asymptote: y = x^3/(9-x^2)
in
Intermediate/Advanced Algebra
I knew I should have stayed in bed, this morning. I better check everything else I did all day... Maybe I didn't get out of bed. Hmmm...
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8 replies | 272 view(s)
12-07-2017,
02:34 PM
tkhunny
replied to a thread
Question about Vertical Asymptote: y = x^3/(9-x^2)
in
Intermediate/Advanced Algebra
We're using the quotient of simple, real-valued polynomials, right? Is there another definition in "Intermediate/Advance Algebra"? No example...
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8 replies | 272 view(s)
12-07-2017,
02:29 PM
tkhunny
replied to a thread
Show that λ is an eigenvalue of the B matrix iff λ is an eigenvalue of B'
in
Calculus
Fair enough. Now the answer to my determinant question...
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5 replies | 242 view(s)
12-07-2017,
09:24 AM
tkhunny
replied to a thread
Radians: Points A, B, C and D divide circumference of circle in the ratio 1:2:3:4...
in
Geometry and Trig
You have done well to use Central Angles to solve the first part. Now, draw the rectangle and switch your thinking to Inscribed Angles. Hint:...
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1 replies | 105 view(s)
12-07-2017,
07:09 AM
tkhunny
replied to a thread
Question about Vertical Asymptote: y = x^3/(9-x^2)
in
Intermediate/Advanced Algebra
Two things: 1a) Make the denominator 0 (zero). These are POTENTIAL vertical asymptotes. 1b) If the numerator is also zero (0) for the same...
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8 replies | 272 view(s)
12-06-2017,
09:58 PM
tkhunny
replied to a thread
Graphing region of integration of triple integral ∫01∫01-x^2∫01-x f(x,y,z)dzdydx
in
Calculus
I can't help you with the drawing, but you have... z = 1 - x -- That's a nice lean-to. y = 1 - x^2 -- That's a nice parabolic cap. You have...
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1 replies | 92 view(s)
12-06-2017,
06:50 PM
tkhunny
replied to a thread
Show that λ is an eigenvalue of the B matrix iff λ is an eigenvalue of B'
in
Calculus
Let's be clear. Please state what B' is. Notation isn't always uniform. Is |\lambda I - B| any different from |\lambda I - B'|
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5 replies | 242 view(s)
12-06-2017,
02:43 PM
tkhunny
replied to a thread
Derivative function: ball thrown vertically has height s = 2 + 20t - 5t^2
in
Calculus
There are basic principles you must understand. Quiz/Refresher. s(t) = 2 + 20t - 5t^2 -- This describes the height of the ball. s(0) = What?...
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4 replies | 196 view(s)
12-06-2017,
02:34 PM
tkhunny
replied to a thread
maybe a stupid question?
in
Beginning Algebra
Rule of Thumb: Concepts are more important than formula memorization - almost always. Rule of Word Problem: If you don't know what something is,...
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4 replies | 208 view(s)
12-06-2017,
02:31 PM
tkhunny
replied to a thread
A question with logarithms: Given log x = 1.322, approximate the value of log (1/x^5)
in
Intermediate/Advanced Algebra
What logarithm rules have you applied to the expression?
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2 replies | 77 view(s)
12-06-2017,
07:03 AM
tkhunny
replied to a thread
Insurance Policies from Mortality Rates
in
Finance/Business Math
You are thinking correctly. t = 1 ==> 0.3*4 = 1.2 -- That's no good. You cannot have a 120% chance of Death. On the other hand, that makes the...
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3 replies | 140 view(s)
12-05-2017,
11:28 PM
tkhunny
replied to a thread
Need help with a fractions problem
in
Arithmetic
Interesting. I think I could go either way, but the question is poorly worded. 1) What portion of "the sandwiches" remains? 5/8 2) What portion...
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12 replies | 567 view(s)
12-05-2017,
09:47 PM
tkhunny
replied to a thread
logarithm problem: 2^N -2^(-N) = C (constant) Solve for N.
in
Intermediate/Advanced Algebra
Usually, a little transformation will do the trick on this sort. 2^{N} - \dfrac{1}{2^{N}} = C 2^{2N} - 1 = C\cdot 2^{N} Do you see it, yet?
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3 replies | 209 view(s)
12-05-2017,
09:41 PM
tkhunny
replied to a thread
Insurance Policies from Mortality Rates
in
Finance/Business Math
Harold lives a whole year after he dies? What have you done, so far? Note: "end of the year" is good. It's a nice, discrete problem. We don't...
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3 replies | 140 view(s)
12-05-2017,
09:27 PM
tkhunny
replied to a thread
How to translate x^2-4x = y^2+9y to be in the form x=a(y-k)^2 + h?
in
Intermediate/Advanced Algebra
Well, there you have it. Now, what's all this about it being a parabola and struggling with fractions? Good work.
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9 replies | 266 view(s)
12-05-2017,
03:48 PM
tkhunny
replied to a thread
Simple Bernoulli trial: prob of pipe failure during inspection
in
Probability / Statistics
The only thing we didn't think about very much was the 23. We counted n = number of inspections. I began to wonder if we have a finite number of...
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12 replies | 570 view(s)
12-05-2017,
09:31 AM
tkhunny
replied to a thread
Simple Bernoulli trial: prob of pipe failure during inspection
in
Probability / Statistics
Well, that was a Binomial Approximation. Is there a distribution that you feel might be more appropriate? Poisson? Beta? Weibull?
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12 replies | 570 view(s)
12-05-2017,
08:10 AM
tkhunny
replied to a thread
Simple Bernoulli trial: prob of pipe failure during inspection
in
Probability / Statistics
:-) That's where I would start. Good work.
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12 replies | 570 view(s)
12-04-2017,
08:28 PM
tkhunny
replied to a thread
simplify x + 40 = (x/2)(e^-200/x) + (x/2)(e^200/x), and solve
in
Intermediate/Advanced Algebra
You cannot "solve" this one, either: x+2 = e^{x}. There are Real Numbers solutions. Who told you to "Solve for x" and why do you believe it is...
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3 replies | 173 view(s)
12-04-2017,
08:20 PM
tkhunny
replied to a thread
How to translate x^2-4x = y^2+9y to be in the form x=a(y-k)^2 + h?
in
Intermediate/Advanced Algebra
If the orientation of the graph is important to your identification, it will not be completely clear until you finish the work of Completing the...
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9 replies | 266 view(s)
12-04-2017,
05:41 PM
tkhunny
replied to a thread
Global minimum if plane A is flying 950km/h and plane is flying 850km/h
in
Intermediate/Advanced Algebra
You need an equation that represents the location. The speed is constant. The equation will be linear. Let's see what you get.
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8 replies | 322 view(s)
12-04-2017,
02:42 PM
tkhunny
replied to a thread
Global minimum if plane A is flying 950km/h and plane is flying 850km/h
in
Intermediate/Advanced Algebra
Couple of things: 1) "Penetration of their pathways" - Is that a point of intersection? If it is, then the minimum distance is 0 km. If it...
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8 replies | 322 view(s)
12-04-2017,
02:35 PM
tkhunny
replied to a thread
game of chance: You must pill 2 marbles of same color from bag of 10 marbles...
in
Probability / Statistics
Please ask yourself a series of questions... p(first pulling a blue) = ?? p(first pulling a white) = ?? p(blue|blue) = ?? p(white|white) = ?? ...
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1 replies | 113 view(s)
12-04-2017,
10:54 AM
tkhunny
replied to a thread
Apple and Blackcurrant: To make a 60ml concentrate the calculation would be...
in
Beginning Algebra
Pick your individual beverage components and equate the VOLUME, not the percent. Apple 10 ml * 100% + Apple (some ml) * 100% = Apple Mixture 60 ml...
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10 replies | 360 view(s)
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About tkhunny
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About tkhunny
Location:
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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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