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tkhunny
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tkhunny
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04-12-2005
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04:10 PM
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Today,
04:07 PM
tkhunny
replied to a thread
Height of a tree
in
Arithmetic
Really, it appears that you must resort to measurement. Grab a ruler an stick it on your screen. How tall is the guy on the ruler measurement? How...
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8 replies | 98 view(s)
Today,
04:03 PM
tkhunny
replied to a thread
Logarithmic Differentiation
in
Calculus
What was the form of the equation immediately before and immediately after applying the logarithm?
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9 replies | 58 view(s)
Today,
01:16 PM
tkhunny
replied to a thread
Linear Algebra - Find Matrix that fits the criteria
in
Intermediate/Advanced Algebra
If all else fails, you can Brute Force it. A = \begin{pmatrix}a & b \\ c & d\end{pmatrix} What do you get for A^2\;then\;A^{2} = I_{2}? Does...
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1 replies | 26 view(s)
Today,
12:36 PM
tkhunny
replied to a thread
Binomial expansion problem
in
Intermediate/Advanced Algebra
In a pinch, with only a few terms, just write them ALL down. This will also help you internalize the formula for immediately writing a single term....
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1 replies | 25 view(s)
Yesterday,
09:07 PM
tkhunny
replied to a thread
I Can’t Stop Doing Practice Problems
in
Intermediate/Advanced Algebra
You should stop doing things that lead only to frustration. Slow down. Breathe... Take your time. Write clearly. WRITE DOWN every step you...
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3 replies | 62 view(s)
Yesterday,
09:04 PM
tkhunny
replied to a thread
definition vs proof
in
Advanced Math
Direct answer to the overlap question, no. Do you have particular definitions in mind? Do you have particular theorems that require proof in mind?
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1 replies | 35 view(s)
Yesterday,
03:51 PM
tkhunny
replied to a thread
help with induction
in
Intermediate/Advanced Algebra
Have you considered the expansion of the first term?
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11 replies | 142 view(s)
Yesterday,
03:47 PM
tkhunny
replied to a thread
Height of a river
in
Arithmetic
Unless you're talking about floods, rivers don't normally have "height". Please use the scale provided and suggest your first estimate.
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1 replies | 26 view(s)
Yesterday,
03:45 PM
tkhunny
replied to a thread
Height of a tree
in
Arithmetic
There MUST be some similar triangles in there, somewhere. Give it a go.
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8 replies | 98 view(s)
Yesterday,
03:42 PM
tkhunny
replied to a thread
Need help finding P ( A ∩ B ): Suppose P(A)=P(A)=0.25 and P(B)=P(B)=0.62...
in
Probability / Statistics
Whoops! Right you are. Repaired above.
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6 replies | 81 view(s)
10-17-2018,
08:39 PM
tkhunny
replied to a thread
basic quadratics help for equation 6m^2 + 11mn + 3n^2
in
Beginning Algebra
The factored form must look like this (am+bn)(cm+dn) a*c = 6, a = 6 and c = 1 or a = 3 and c = 2 or a = 1 and c = 6 or a = 2 and c = 3. There are...
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6 replies | 157 view(s)
10-17-2018,
08:33 PM
tkhunny
replied to a thread
Need help finding P ( A ∩ B ): Suppose P(A)=P(A)=0.25 and P(B)=P(B)=0.62...
in
Probability / Statistics
P(A|B) = P(A AND B)/P(B)? Is that ALL the information we have? Are A and B mutually exclusive?
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6 replies | 81 view(s)
10-12-2018,
01:39 PM
tkhunny
replied to a thread
arcsin and arctan: arcsin(1/sqrt[5]) = (1/2) arctan(4/3); arcsin(th x) = arctan(sh x)
in
Beginning Algebra
That's an arcsin(), not a sin(). What are you squaring? Are we to prove the equivalence in 1? Typically, one would: 1) Draw a right triangle....
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2 replies | 169 view(s)
10-12-2018,
01:30 PM
tkhunny
replied to a thread
integrate Area of a rt triangle w/ hypotenuse=r, horizontal=x, vertical=sqrt(r2-x2)
in
Calculus
1) Your limits can't use the same variable as your argument. 'x' means two different things. Fix that. 2) Why are we doing sines and confusing...
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14 replies | 356 view(s)
10-09-2018,
09:09 PM
tkhunny
replied to a thread
Please help 🙋 "Water shoots out from a horizontal pipe which is at a height of 52cm"
in
Intermediate/Advanced Algebra
The angle is given in the problem statement. Now what?
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1 replies | 169 view(s)
10-09-2018,
09:02 PM
tkhunny
replied to a thread
Inverse functions equations: Why is arcsin(x) = pi an impossible equation?
in
Geometry and Trig
1) I cannot tell what it is you are demonstrating. "sin(pi) = 0.54..." doesn't mean anything. 2) Who says arcsin(x) = pi is "impossible"? Besides...
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5 replies | 143 view(s)
10-09-2018,
08:44 PM
tkhunny
replied to a thread
Given (2,3) (2, 5) (2, 11) (2, 17), find next three sets
in
Intermediate/Advanced Algebra
As always, "the next in the series" question is hopelessly conceived. There are infinitely many answers to ANY set of finite beginnings. For this...
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7 replies | 219 view(s)
10-09-2018,
08:36 PM
tkhunny
replied to a thread
Math question help please: Nutrients come in npk values. Nitrogen, phosphorus, potass
in
Arithmetic
"...makes sense..." -- Not really. One guess... In this mysterious arithmetic, does 2-1-1 suggest 2+1+1 = 4 or 4% = 4 pph(undred) = 40...
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2 replies | 219 view(s)
10-08-2018,
03:04 PM
tkhunny
replied to a thread
Matrix with complex numbers: 2ix + y - z = -1 -x +3y +2z = 5 - 7i 3x + (1+iy) - iz =
in
Intermediate/Advanced Algebra
"doesn't seem right" is a big red flag. Be more careful. Be more systematic. 1) 2i 1 -1 -1 2) -1 3 2 (5-7i) Multiply #2 by 2i 1) 2i 1...
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1 replies | 103 view(s)
10-07-2018,
07:07 PM
tkhunny
replied to a thread
Regression Analysis - How to Read Prediction Data
in
Probability / Statistics
An explanation including "x-variable" and "y-variable" indicates mechanical understanding of what you are doing. You later refer to "predictor" or...
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1 replies | 65 view(s)
10-03-2018,
04:13 PM
tkhunny
replied to a thread
Constrained Optimization f(x; y) = x s.t. y =-1/2x*2 + 2x and y =1/2x*2 - 2x + 4
in
Calculus
Not everything is easily expressible as a nice function. Sometimes all you have is a map. It seems to me that we're demonstrating the graphical...
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2 replies | 105 view(s)
09-30-2018,
10:36 AM
tkhunny
replied to a thread
polynomials: why must polynomials be ordered by degree in order to properly divide by
in
Beginning Algebra
It has nothing to do with division. It is a matter of convenience, convention, and natural order. What does this number mean? 1084? You...
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2 replies | 258 view(s)
09-28-2018,
09:25 PM
tkhunny
replied to a thread
Find the slope of the tangent line on f at x=1
in
Calculus
I hope you did not use that formula. That would be totally wrong. Try this one: lim h->0 / h
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3 replies | 184 view(s)
09-28-2018,
09:22 PM
tkhunny
replied to a thread
Exponential Function Question: Coal reserves in a country in 2018 are 11,750 Quads
in
Intermediate/Advanced Algebra
Use your hint, twice. 0.5 = C(0) = C_{0}\cdot e^{\lambda (0)} 15 = C(100) = C_{0}\cdot e^{\lambda (100)} See where that leads.
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2 replies | 191 view(s)
09-24-2018,
08:31 PM
tkhunny
replied to a thread
How to calculate a fixed rate of interest on a Balloon Payment loan
in
Finance/Business Math
Ah! Didn't think of that even though that is how it reads. I had one additional regular payment.
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25 replies | 1116 view(s)
09-24-2018,
04:54 PM
tkhunny
replied to a thread
How to calculate a fixed rate of interest on a Balloon Payment loan
in
Finance/Business Math
...not if it's proprietary and we're trying to steal IP.
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25 replies | 1116 view(s)
09-24-2018,
03:17 PM
tkhunny
replied to a thread
How to calculate a fixed rate of interest on a Balloon Payment loan
in
Finance/Business Math
I've begun to believe, being moved upon by the spirit of something, that "4.07" is a flat charge of some sort, rather than an interest rate of any...
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25 replies | 1116 view(s)
09-24-2018,
10:55 AM
tkhunny
replied to a thread
How to calculate a fixed rate of interest on a Balloon Payment loan
in
Finance/Business Math
It does help to have correct information. 1) The first two 30's are incorrect. The lump is not included in the Total Paid. 2) (1 +...
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25 replies | 1116 view(s)
09-23-2018,
07:39 PM
tkhunny
replied to a thread
Stumped: Four military recruits whose respective shoe sizes are 7,8,9 & 10....
in
Probability / Statistics
What is the probability that all recruits will receive boots of an incorrect size?" Sometimes it helps to rethink... What is the probability...
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9 replies | 348 view(s)
09-22-2018,
04:29 PM
tkhunny
replied to a thread
Mechanics: A man throws a tennis ball into the air so that, at the instant....
in
Intermediate/Advanced Algebra
m/s^-1 -- Are you SURE about this notation? You should have a standard setup for this sort of thing. It just means: x(t) = ½gt^{2} + v_{0}t +...
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2 replies | 208 view(s)
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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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