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tkhunny
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tkhunny
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Join Date
04-12-2005
Last Activity
10-12-2018
07:54 PM
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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 | 161 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 | 334 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 | 159 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 | 139 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 | 212 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 | 202 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 | 99 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 | 64 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 | 104 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 | 256 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 | 182 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 | 185 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 | 1103 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 | 1103 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 | 1103 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 | 1103 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 | 343 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) = ˝gt^{2} + v_{0}t +...
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2 replies | 204 view(s)
09-22-2018,
04:20 PM
tkhunny
replied to a thread
STATistics help!
in
Probability / Statistics
1) Too small. Can't read it. 2) If this is foreign to you, why have you been given this problem? 3) If this is a Placement Test, you should get it...
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2 replies | 149 view(s)
09-22-2018,
04:17 PM
tkhunny
replied to a thread
how is this read? p1 p2 p3 p4
in
Arithmetic
"square" No. That's only if it's a 2. Vocabulary Words: 1) Exponent 2) Subscript In actuarial notation, they mean about 10 other things,...
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4 replies | 262 view(s)
09-21-2018,
05:55 PM
tkhunny
replied to a thread
Logarithm solving problem: Log(8) + Log(x) = 6 Log (5)
in
Intermediate/Advanced Algebra
Please use the basic rules of logarithms. \log(a) + \log(b) = \log(a\cdot b) a\cdot\log(b) = \log\left(b^{a}\right)
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2 replies | 202 view(s)
09-20-2018,
07:03 PM
tkhunny
replied to a thread
How to calculate a fixed rate of interest on a Balloon Payment loan
in
Finance/Business Math
The real question is, what is it that you are trying to do? Why would the "Interest Rate" be substantially different from the "APR"? That makes no...
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25 replies | 1103 view(s)
09-18-2018,
05:14 PM
tkhunny
replied to a thread
What is the method of solving called what you do to one side do to the other called?
in
Intermediate/Advanced Algebra
Failing to do it is called "error". It is not a valid step in any list I ever have encountered. It is a device to remember that equivalence must...
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4 replies | 289 view(s)
09-18-2018,
05:11 PM
tkhunny
replied to a thread
Get distance from XY position unto the nearest point of a square
in
Geometry and Trig
Can it be inside? I would extend all four sides of the square, defining 8 external regions. this gives only three things to do, depending on...
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4 replies | 254 view(s)
09-17-2018,
10:21 PM
tkhunny
replied to a thread
Question about circumference
in
Geometry and Trig
I stand by #3. "Circumference" can be either the distance around something, not necessarily a circle, or the enclosing boundary itself.
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6 replies | 341 view(s)
09-17-2018,
08:38 PM
tkhunny
replied to a thread
Question about circumference
in
Geometry and Trig
1) line SEGMENT 2) Definition. A circumference must enclose something. 3) Sometimes, the circumference may refer to the linear distance only, and...
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6 replies | 341 view(s)
09-17-2018,
05:25 PM
tkhunny
replied to a thread
Area of a sector of a circle (shaded portion)
in
Calculus
If only there were a way to know what the machine wants. Maybe add units? Maybe two decimal places?
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6 replies | 261 view(s)
09-17-2018,
04:36 PM
tkhunny
replied to a thread
Area of triangle with angle of 5*pi/6
in
Geometry and Trig
Come now, Elissa. Math doesn't hate you. :-) In this case, you have reasoned it out nicely. You need just one more clue from the problem...
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3 replies | 185 view(s)
09-17-2018,
10:40 AM
tkhunny
replied to a thread
Approximating probability P (X<0.56) for n=10 using central limit theorem
in
Probability / Statistics
Rather than argue with the hint, why not think about what the Central Limit Theorem does an give the question more thought? The Central Limit...
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2 replies | 176 view(s)
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About tkhunny
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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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10-12-2018
07:54 PM
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