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JeffM
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JeffM
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09-14-2012
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02:14 PM
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Today,
12:01 AM
JeffM
replied to a thread
Logic Question
in
Advanced Math
That story is so depressing that, as consolation, I am going to blow my diet by having an Armagnac and chocolates.
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16 replies | 268 view(s)
Yesterday,
11:41 PM
JeffM
replied to a thread
how to simplify this radical fraction: 4th-root[ 225 / 81 ]
in
Intermediate/Advanced Algebra
Jomo This was triggered by response # 7, which was not a question but a purported answer to the original questions. I do not deem questions by a...
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19 replies | 303 view(s)
Yesterday,
11:17 PM
JeffM
replied to a thread
how to simplify this radical fraction: 4th-root[ 225 / 81 ]
in
Intermediate/Advanced Algebra
pka He wasn't the OP in any case so his questions are irrelevant.
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19 replies | 303 view(s)
Yesterday,
10:46 PM
JeffM
replied to a thread
Sell price based on desired profit: X = sell price B = buy price A = amt invested in
in
Finance/Business Math
d = (x - b) * s. a = bs. \text { ASSUME } a > 0 < b. Because a is an amount of money and b is a price, it is reasonable to assume that both...
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2 replies | 43 view(s)
Yesterday,
10:44 AM
JeffM
replied to a thread
Logic Question
in
Advanced Math
First, what is higher education healthcare? There is no doubt that the educational system is a mess, but has it been hospitalized? Second, I...
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16 replies | 268 view(s)
12-13-2018,
09:51 PM
JeffM
replied to a thread
Find the missing number: "Kristen wrote numbers in 5 of the 10 circles..."
in
Arithmetic
I worked out the answer using basic algebra, but why on earth would anyone think that this is a useful problem for teaching arithmetic?
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8 replies | 152 view(s)
12-13-2018,
11:26 AM
JeffM
replied to a thread
Partial Differential: For f(x,t), df = [(partial f)/(partial x)] * dx
in
Calculus
Halls Viona is reading some book in physics that seems to be more than a bit casual in its use of mathematical notation. She really needs to give...
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3 replies | 141 view(s)
12-12-2018,
06:32 AM
JeffM
replied to a thread
Tutoring and such...
in
Math Odds & Ends
The problem with romantic poetry is that once you take the music away, the sense left behind is often very small. Take away all of Daudet's sibilants...
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13 replies | 217 view(s)
12-12-2018,
12:01 AM
JeffM
replied to a thread
Tutoring and such...
in
Math Odds & Ends
Thanks. I do try. The real difficulty is deciding what a student's limits are. What I see in those I tutor is that they are frustrated by a...
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13 replies | 217 view(s)
12-11-2018,
10:17 PM
JeffM
replied to a thread
Tutoring and such...
in
Math Odds & Ends
I NEVER tutoye my tutees.
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13 replies | 217 view(s)
12-11-2018,
10:14 PM
JeffM
replied to a thread
Tutoring and such...
in
Math Odds & Ends
No?
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13 replies | 217 view(s)
12-11-2018,
07:25 PM
JeffM
replied to a thread
Surd Problem
in
Intermediate/Advanced Algebra
No problem. The problem with TEACHING math is that steps that have become obvious through experience to the teacher are left out. I see w =...
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15 replies | 355 view(s)
12-11-2018,
02:56 PM
JeffM
replied to a thread
Surd Problem
in
Intermediate/Advanced Algebra
Some useful basic rules. a * 1 \equiv a \equiv 1 * a. Rule 1. \dfrac{b}{1} \equiv b. Rule 2. c \ne 0 \implies \dfrac{c}{c} = 1. Rule 3. ...
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15 replies | 355 view(s)
12-11-2018,
02:04 PM
JeffM
replied to a thread
Surd Problem
in
Intermediate/Advanced Algebra
Are you serious? (4 - 2a) * a = 4a - (2 * a * a) = 4a - 2a^2, right? a = \sqrt{3} \implies (4 - 2\sqrt{a}) * \sqrt{a} = 4\sqrt{3} -...
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15 replies | 355 view(s)
12-11-2018,
01:10 PM
JeffM
replied to a thread
Calculation Logic/Reasoning: A house is valued at $15K, and it is insured for $8K...
in
Finance/Business Math
OK. Let's take this in steps. As denis said, it is a mathematical fact that \dfrac{a}{b} * c = \dfrac{a}{b} * \dfrac{c}{1} = \dfrac{ac}{b} =...
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6 replies | 244 view(s)
12-11-2018,
11:28 AM
JeffM
replied to a thread
Hard Inverse function f(x) problem
in
Intermediate/Advanced Algebra
See whether the fifth post in this thread answers your question. http://mymathforum.com/pre-calculus/345432-hard-inverse-function-f-x-problem.html...
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15 replies | 446 view(s)
12-11-2018,
12:03 AM
JeffM
replied to a thread
A spent $27, E $9, S $36; who pays how much to whom, to even up what each paid?
in
Arithmetic
LOL Gotta keep an eye on that guy Satan.
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7 replies | 200 view(s)
12-10-2018,
11:57 PM
JeffM
replied to a thread
Calculation Logic/Reasoning: A house is valued at $15K, and it is insured for $8K...
in
Finance/Business Math
Hmm. This is of course true, but I don't think it quite resoves the OP's confusion.
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6 replies | 244 view(s)
12-10-2018,
11:48 PM
JeffM
replied to a thread
Calculation Logic/Reasoning: A house is valued at $15K, and it is insured for $8K...
in
Finance/Business Math
Coinsurance is the percentage of the market value that the insured is obliged to insure. On a 15,000 dollar house with a coinsurance requirement of...
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6 replies | 244 view(s)
12-10-2018,
10:02 PM
JeffM
replied to a thread
binomial theorem / expansion
in
Calculus
Well, I am lost. We start with a summation symbol referencing k, but nothing to sum and neither a starting nor ending value for k. We have a...
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7 replies | 228 view(s)
12-09-2018,
05:51 PM
JeffM
replied to a thread
Business Math: 20 agents handling 6 calls per hour over 7 working hours,
in
Probability / Statistics
You have 20 agents, each working 7 hours a day and each averaging 6 calls an hour. That implies your current volume of calls is indeeed 20 * 7 * 6...
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5 replies | 241 view(s)
12-09-2018,
04:11 PM
JeffM
replied to a thread
How to solve these problems: $8,000 is to be repaid with quarterly payments
in
Finance/Business Math
Denis, His notation is a bit strange, but not indecipherable. p = \dfrac{ai}{1 - \left ( \dfrac{1}{1 + i} \right )^n} In step a, he...
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8 replies | 202 view(s)
12-09-2018,
03:37 PM
JeffM
replied to a thread
A spent $27, E $9, S $36; who pays how much to whom, to even up what each paid?
in
Arithmetic
This, like many practical problems, can be solved through a sequence of arithmetic problems. How much was spent in total? So how much should...
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7 replies | 200 view(s)
12-09-2018,
03:16 PM
JeffM
replied to a thread
Help with understanding dividing fractions
in
Arithmetic
Nice essay.
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12 replies | 413 view(s)
12-09-2018,
03:04 PM
JeffM
replied to a thread
Help with understanding dividing fractions
in
Arithmetic
Oh, wow, thanks. Shall fix it immediately.
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12 replies | 413 view(s)
12-09-2018,
02:26 PM
JeffM
replied to a thread
Linear Equations: teacher distributes $2 among 20 children...
in
Beginning Algebra
I approach teaching how to solve word problems in a way that is completely different from standard pedagogy. Algebra is about working with numbers...
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5 replies | 252 view(s)
12-09-2018,
12:57 PM
JeffM
replied to a thread
Help with understanding dividing fractions
in
Arithmetic
It is of course exciting that your son made an arithmetic discovery through experimentation. Good for him. But aside from being very simple to...
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12 replies | 413 view(s)
12-08-2018,
05:16 PM
JeffM
replied to a thread
Vocabulary - Evaluation/Assessment
in
Intermediate/Advanced Algebra
What is the source and context of your quotation?
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2 replies | 136 view(s)
12-08-2018,
04:02 PM
JeffM
replied to a thread
Max area
in
Calculus
Please read https://www.freemathhelp.com/forum/threads/112086-Guidelines-Summary?p=433156&viewfull=1#post433156 I may misunderstand what you...
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3 replies | 145 view(s)
12-08-2018,
12:17 PM
JeffM
replied to a thread
Asymptotic behavior: (d^2 u)/(dp^2) = [1 - (p_0)/p + {L(L+1)}/(p^2)]u
in
Differential Equations
I think they are implicitly defining something. Very obscure if that is what is going on. That is, I guess they are doing this: \text {Define }...
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2 replies | 216 view(s)
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