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• Today, 21:33
The region $R$ is a rectangle having the vertices: (0,1),\,(1,1),\,(1,-1),\,(0,-1) One way we can compute the volume is: ...
4 replies | 47 view(s)
• Today, 19:41
MarkFL replied to a thread logs in Pre-Algebra and Algebra
Okay, we are given: \ln\left(x-\frac{1}{x}-3\right)=2 Converting from logarithmic to exponential form, we have: x-\frac{1}{x}-3=e^2 ...
1 replies | 12 view(s)
• Today, 15:26
As for the $\LaTeX$, look under the "Calculus/Analysis" section of our Quick $\LaTeX$ tool. You will find it, which gives the code: ...
4 replies | 47 view(s)
• Today, 10:48
MarkFL replied to a thread The Fonz and Geometry in Chat Room
Yes, and I was just pointing out that there can be other reasons a student fails besides lack of innate ability to understand the material, or an...
5 replies | 63 view(s)
• Today, 10:18
MarkFL replied to a thread The Fonz and Geometry in Chat Room
If a child's parents consistently put a child down, then I think this can have negative consequences on the child. I think there are a great many...
5 replies | 63 view(s)
• Yesterday, 23:08
I disagree with this...I think it is the societal attitude that it's okay to fail at math that is part of the problem. Someone says to their friends,...
9 replies | 94 view(s)
• Yesterday, 22:23
If we have 2000 people, 300 of which are women, then the probability that all 300 women will be on the same team is given by: P(A)=\frac{{1700...
5 replies | 50 view(s)
• Yesterday, 22:01
I think your second method is correct. Suppose we call the teams $X$ and $Y$...and now we need only look at one team, so let's look at team $X$. If...
5 replies | 50 view(s)
• Yesterday, 19:04
MarkFL replied to a thread Solar Eclipse 2017 in Chat Room
Yesterday during the big event, we had pervasive heavy cloud cover and intermittent rain. Today, sunny and clear all day. Story of my life...(Giggle)
8 replies | 233 view(s)
• August 21st, 2017, 12:26
Here is this week's POTW: ----- If a quadrilateral is circumscribed about a circle, prove that its diagonals and the two chords joining the...
0 replies | 38 view(s)
• August 21st, 2017, 12:22
Suppose \frac{3}{2}\le x \le 5. Prove that 2\sqrt{x+1}+\sqrt{2x-3}+\sqrt{15-3x}<2\sqrt{19}. Congratulations to MarkFL for his correct...
1 replies | 92 view(s)
• August 20th, 2017, 21:11
my solution: with transformation $y=tan(x),dy=sec^2(x)dx$ I = \int_{0}^{\dfrac{\pi}{4}}\left(\tan x + \cot x \right)\left ( \dfrac{\tan x}{1 +...
4 replies | 142 view(s)
• August 20th, 2017, 10:02
$-2+3 ln2$
4 replies | 142 view(s)
• August 20th, 2017, 01:29
MarkFL posted a visitor message on Peter's profile
Hey Peter! (Wave) I edited your post to remove the duplicate content. Sorry for the late reply, I was busy "powering through" a tedious 3 hour...
• August 19th, 2017, 22:48
to find the value of $f(\alpha)=-17+21\sqrt 3 i$ and $f(\beta)=-17-21\sqrt 3i$ seemed time-consuming do you have a better way to get them ?
10 replies | 261 view(s)
• August 18th, 2017, 20:20
yes a miscalculation found the answer is 43524 the solution has been edited what a shame ! my poor calculation
10 replies | 261 view(s)
• August 18th, 2017, 11:01
$f(x)=x^3+20x-17$ $f(r)=r^3+20r-17=0---(1)$ ($r$ is a root of $f$) $f(r+1)=(r+1)^3+20(r+1)-17=3r^2+3r+21$ from $(1):$...
10 replies | 261 view(s)
• August 18th, 2017, 09:04
my solution: for $r_1^3+20r_1-17=r_2^3+20r_2-17=r_3^3+20r_3-17=0$ Using Vieta's formulas $r_1+r_2+r_3=0---(1)$ $r_1r_2+r_2r_3+r_3r_1=20---(2)$...
10 replies | 261 view(s)
• August 17th, 2017, 05:03
my solution: let $A=8x^2-2xy^2$ $B= 6y$ $C= 3x^2+3x^3y^2$ from $A,B$ we have $xy^2+3y-4x^2=0-----(1)$ from $B,C$ we have...
3 replies | 146 view(s)
• August 17th, 2017, 02:10
Small quibble...axis of symmetry is: t=-\frac{1}{105} So, since the parabola opens up, the vertex is a minimum, so the minimum distance will be...
8 replies | 174 view(s)
• August 17th, 2017, 00:59
For a parabola of the form: f(x)=ax^2+bx+c We know the axis of symmetry is at: x=-\frac{b}{2a} So, for:
8 replies | 174 view(s)
More Activity

### 16 Visitor Messages

1. Hi Albert,

I was meant to reply to the PM but it seems to me your account here has exceeded your stored private messages quota and hence you cannot receive new message(s).

Anyway, I just wanted to thank you for reply and guess what, I just solved that challenge! Hurray! Haha...

Best,

anemone
2. Hi Albert,

I am aware that to editing our own post of less than 24 hours old (which I think is a good thing rather than keep adding responses by posting new follow-up posts to make mess of the look of one particular thread) is encouraged and not frowned upon, but I wanted to also let you know I have come to realize of your latest edit/update to my latest challenge only when I was about to reply to it. If by any chance I missed reading it, that would be unfair to you because your newest edited post deserves a credit, imho.

Thus in the future if you want to do a major edit to your previous post, I would recommend you to instead add another reply beneath your previous post, does that sound good to you, Albert?

Best wishes,

anemone
3. Hi Albert, congratulations on winning the MHB Challenges Award!
4. Hi Albert,

I wanted to say that I like your profile .sig, Little Prince was a story I read almost 2 years ago but it still touches my heart. It was the best story I ever have read in my life.

Best Regards,
Balarka
.
5. Hello, me again Albert!

Here is what our administrator Jameson has said regarding the issue:

"Ok, when that happens all he needs to do is reload the page. It should eventually render correctly. There's no need for more info. This happens for me periodically as well and I just reload the page. The only issue would be if after reloading many times he still couldn't see Latex."

So, when it happens again, try reloading the page, and if after several times the error still occurs, capture a screen shot and email the image to me.

Best Regards,

Mark.
6. Hello again Albert,

The staff here would really like to help, and it would be informative for use if you could get a screen shot of the error and email it to me, and I will forward it to the staff so we can see exactly what the error looks like at your end.

Best Regards,

Mark.
7. Hello Albert,

I have reported your problem to the staff here, and I can assure you they are a very knowledgeable and involved team of administrators whose primary goal is that our member's problems get addressed promptly.

Best Regards,

Mark
8. Hello Albert,

First I wanted to ask you if the issue you had yesterday was resolved...I waited for your email of the problem description but never got it. I want to help you get to the bottom of the problem if I can.

Second, I edited your latest post of the solution to the minimization problem. We try not to link to other math forums unless we are showing where a problem comes from if posted by someone else, to give credit to the OP. Since this problem is yours, you should post the solution at both places rather than at one, and then linking to that at the other.

Your contributions here are appreciated!

Best Regards,

Mark.
9. Hi Albert! Please use titles which represent the nature of your question. I have renamed your following threads:

1) http://www.mathhelpboards.com/f28/fi...equation-3193/ (Original title: please find n)

2) http://www.mathhelpboards.com/f28/bi...-squares-3198/ (Original title: mission impossible)
10. Hi again! You have asked in your thread >>here<< how to move a thread if you accidentally posted in a wrong sub-forum. The answer is you can't do that. However you can report the post by clicking on the little triangle (shown below) and writing down your request. I have moved your thread to the Challenge Questions and Puzzles sub-forum.

Showing Visitor Messages 1 to 10 of 16
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#### Basic Information

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math,program,literature,music
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math teacher
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One sees clearly only with the heart.Anything essential is invisible to the eyes
_______From The Little Prince By Antoine de Saint-Exupery

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### 9 Friends

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Paris la ville de l'amour

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#### August 11th, 2017

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Name: MHB Challenges Award (2014)
 Issue time: January 3rd, 2015 15:30 Issue reason:

Name: MHB Challenges Award (Jan-June 2013)
 Issue time: July 1st, 2013 22:20 Issue reason: