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• 04-22-2018, 06:33 PM
This is really confusing. 10% of what. A percent without describing what it is a percentage of is meaningless. Let's leave that idiocy behind us....
2 replies | 101 view(s)
• 04-22-2018, 06:15 PM
I must admit that I am at a loss. Why do you want to falsify what your data say? If the actual highest point is 80%, why do you want say it is 95%? ...
4 replies | 117 view(s)
• 04-21-2018, 10:41 AM
I agree with Dr. Peterson. It is a good thing to point out that it is possible to be given a problem that has no answer, to be given a problem...
9 replies | 201 view(s)
• 04-20-2018, 09:12 PM
As stapel said, the problem as stated is insoluble. ASSUME THERE IS A SOLUTION. Therefore, to get exactly 45 mg of ascorbic acid, we calculate...
9 replies | 201 view(s)
• 04-18-2018, 09:10 PM
You can attempt to solve any system of simultaneous equations by the method of substitution. Example. x^2 + y - z = 41. x + y + z = 7. 5x +...
11 replies | 302 view(s)
• 04-18-2018, 04:29 PM
Integers are either even or odd. An even integer can be expressed as 2 times an integer. So it is easy to demonstrate that the sum of two even...
8 replies | 210 view(s)
• 04-17-2018, 12:16 PM
You can easily prove it with calculus by setting up a function with three variables and using a LaGrangian multiplier. But are you supposed to do...
14 replies | 401 view(s)
• 04-17-2018, 10:04 AM
You certainly did make a mistake. \dfrac{x^2}{2x + 1} is a function becaus x is a variable. Its rate of increase is \dfrac{4x^2 +2x - 2x^2}{(2x...
14 replies | 401 view(s)
• 04-17-2018, 09:20 AM
I have not worked this out, in part because I am busy with other things and in part because we have no clue what the OP is studying: this is...
14 replies | 401 view(s)
• 04-17-2018, 08:57 AM
Probably better in calculus or business math. You have a Cobb-Douglas production function with two inputs priced in fully competitive markets....
2 replies | 87 view(s)
• 04-16-2018, 11:23 PM
Jomo abc = 1 \implies bc = \dfrac{1}{a} \implies \dfrac{a}{2 + bc} = \dfrac{a}{2 + \dfrac{1}{a}} * \dfrac{a}{a} = \dfrac{a^2}{2a + 1}. And so...
14 replies | 401 view(s)
• 04-16-2018, 05:02 PM
If you have a calculator that can factor polynomials, then you are not using your calculator properly. If, as appears to be the case, you were...
21 replies | 280 view(s)
• 04-16-2018, 08:39 AM
I seldom post on geometry problems because I have forgotten most theorems, but here is a method of attack that I suspect will work. It combines Dr....
4 replies | 161 view(s)
• 04-15-2018, 05:49 PM
\dfrac{n!}{2^n} = \dfrac{\displaystyle \prod_{j=1}^nj}{\displaystyle \prod_{j=1}^n 2} = \displaystyle \prod_{j=1}^n\dfrac{j}{2}. It should be...
2 replies | 145 view(s)
• 04-15-2018, 12:26 PM
With respect to the third problem, what is a prime number? How might you determine whether a number is prime or not?
4 replies | 303 view(s)
• 04-15-2018, 12:24 PM
This is NOT an answers site. As its name says, it is a HELP site. We cannot help you if you tell us nothing about what you are studying, what...
4 replies | 303 view(s)
• 04-14-2018, 09:15 PM
Alternatively, you could use the Quadratic Formula: x^2 = 4x + 3 \implies x^2 - 4x - 3 = 0 \implies x = \dfrac{-(-\ 4) \pm \sqrt{(-\ 4)^2 -...
3 replies | 177 view(s)
• 04-14-2018, 08:35 PM
Or try the integer root theorem.
3 replies | 177 view(s)
• 04-13-2018, 10:01 PM
JeffM replied to a thread Denis Is Jealous in Math Odds & Ends
Spelled \$ally?
11 replies | 356 view(s)
• 04-13-2018, 06:54 PM
JeffM replied to a thread Denis Is Jealous in Math Odds & Ends
Please do NOT tell me what she said "yes" to. I am sensitive.
11 replies | 356 view(s)
• 04-13-2018, 12:52 PM
\dfrac{71,841}{71,841 + 49,964} \approx 59\%. Check \dfrac{49,964}{71,841 + 49,964} \approx 41\%. Now this may not be an equitable split...
5 replies | 220 view(s)
• 04-12-2018, 06:04 PM
3^2 = a - 1 \implies 9 = a - 1 \implies 9 + 1 = a - 1 + 1 \implies 10 = a + 0 \implies a = 10.
5 replies | 123 view(s)
• 04-12-2018, 04:41 PM
When you rearrange the first equation to get an equivalent equation and then substitute back into the first equation, you have not introduced any new...
5 replies | 162 view(s)
• 04-11-2018, 06:44 PM
I point out that this is a system of quadratic equations. I at least do not know a general method of determining whether quadratic equations are all...
4 replies | 199 view(s)
• 04-11-2018, 09:11 AM
The question makes no sense. For example, what is the definition of an "approximate average" and how does it differ from an arithmetic mean or a...
2 replies | 94 view(s)
• 04-10-2018, 10:13 PM
And what facts were regurgitated? And if you already knew those as "facts," then what was your problem in the first place? So run along and "get your...
5 replies | 253 view(s)
• 04-10-2018, 02:13 PM
The only fractions that can be expressed exactly in decimal notation are those with denominators that are a power of 2 times a power of 5. No other...
7 replies | 248 view(s)
• 04-10-2018, 12:37 PM
This is simply wrong: x^5 = 32 has an integer solution. A form of proof previously unknown to me. Because you have not given any solution to...
10 replies | 260 view(s)
• 04-10-2018, 11:57 AM
Jonathan You seem have got a lot further than I have, at least so far. With respect to your first point, a quintic can have integer roots so...
10 replies | 260 view(s)
• 04-10-2018, 10:49 AM
I would not like to see every first question answered by a mandatory, standardized response that necessarily ignored the substance of the question. I...
4 replies | 604 view(s)
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