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• May 24th, 2018, 16:00
MarkFL replied to a thread Word problem on vectors in Geometry
Hello, and welcome to MHB, Gummg! (Wave) I would write the plane's velocity vector as: \vec{v}=485\left\langle...
3 replies | 78 view(s)
• May 23rd, 2018, 11:43
Here is this week's POTW: ----- Prove that there are only a finite number of possibilities for the ordered triple $(a-b,\,b-c,\,c-a)$ where...
0 replies | 67 view(s)
• May 23rd, 2018, 11:40
Congratulations to the following members for their correct solution:): 1. Olinguito 2. Opalg Solution from Opalg: If...
1 replies | 104 view(s)
• May 22nd, 2018, 14:03
Here's the image you tried to hotlilnk:
4 replies | 97 view(s)
• May 22nd, 2018, 00:46
I would take Greg's advice and write: 5\sqrt{2}\pm7=(b\sqrt{2}\pm a)^3=\pm...
5 replies | 146 view(s)
• May 20th, 2018, 23:49
Where does "it" say that?
11 replies | 17728 view(s)
• May 16th, 2018, 20:53
MarkFL replied to a thread Jokes in Chat Room
175 replies | 24424 view(s)
• May 15th, 2018, 11:20
Here is this week's POTW: ----- Prove that if $11z^{10}+10iz^9+10iz-11=0$, then ${\left| z \right|}=1$. (Here $z$ is a complex number and...
1 replies | 104 view(s)
• May 15th, 2018, 11:15
No one answered last week POTW. :( You can find the suggested solution as follows: For $0<x<1$, we have $\ln... 1 replies | 102 view(s) • May 14th, 2018, 23:15 We know: \sum_{k=1}^n(k)=\frac{n(n+1)}{2} And so the given series becomes: ... 1 replies | 91 view(s) • May 12th, 2018, 09:10 He posted a question in one of my vB product threads, which leads me to believe he may run his own site. 7 replies | 250 view(s) • May 11th, 2018, 19:31 Do you own/admin your own site? 7 replies | 250 view(s) • May 11th, 2018, 11:53 Hello, and welcome to MHB! (Wave) 7 replies | 250 view(s) • May 11th, 2018, 11:34 That would require another product, as that's not what this product is intended for. :) 3 replies | 248 view(s) • May 10th, 2018, 15:26 MarkFL replied to a thread solve for x in Pre-Algebra and Algebra Is the equation: 2^{3x}+1=32 Or: 2^{3x+1}=32 I suspect it is the latter, but I want to be sure first. :) 5 replies | 142 view(s) • May 9th, 2018, 03:00 Yes, I get equivalent results. (Yes) 6 replies | 283 view(s) • May 9th, 2018, 00:32 I got the equivalent: x_2(t)=\frac{\alpha-3}{10\alpha}e^{-3t}\left(1-e^{\alpha t}\right) Now, for the optimization of this function, recall we... 6 replies | 283 view(s) • May 8th, 2018, 21:48 MarkFL replied to a thread Hi in Introductions Hello! Glad you found us. (Wave) 3 replies | 161 view(s) • May 8th, 2018, 21:44 I would begin with: \d{x_1}{t}=-3x_1 where x_1(0)=\frac{1}{10} Hence: x_1(t)=\frac{e^{-3t}}{10} Then: 6 replies | 283 view(s) • May 8th, 2018, 10:44 Hi MHB! I am back to posting our High School POTW.(Smile) During my hiatus, MarkFL has been so supportive and his willingness to fill in for me... 1 replies | 102 view(s) • May 8th, 2018, 10:40 Congratulations to Ackbach for his correct solution, which you can find below: (a) We draw the Free Body Diagram (FBD): \begin{tikzpicture} ... 1 replies | 103 view(s) • May 8th, 2018, 09:48 Yes, that is one of the behaviors of spammers. Unfortunately, this gets innocent posts like the one above moderated as well. But, as with everything... 10 replies | 623 view(s) • May 8th, 2018, 09:26 The post was put into the moderation queue because a new user "necroposted." I have just approved the post. 10 replies | 623 view(s) • May 6th, 2018, 11:24 All the assumptions were posted. 9 replies | 162 view(s) • May 5th, 2018, 19:28 I would speak to the professor to see what's up with that question. :) 4 replies | 132 view(s) • May 5th, 2018, 13:08 advanced:... 4 replies | 132 view(s) • May 5th, 2018, 11:35 The slope of the line can be found from: ... 4 replies | 132 view(s) • May 4th, 2018, 22:28 Well, that's a tiny graph, which isn't very easy to read. I would begin with the amplitude A(x)=a\left(e^{bx}+d\right) Let's say: ... 9 replies | 162 view(s) • May 4th, 2018, 21:07 If$d=0$and presumably$b<0$, then what would prevent the amplitude from tending to zero as$x\to\infty$, instead of some value greater than zero? 9 replies | 162 view(s) • May 4th, 2018, 15:33 MarkFL replied to a thread Trig ratio challenge in Trigonometry Why is this posted here in the Challenges forum? 6 replies | 194 view(s) • May 3rd, 2018, 21:27 It appears to me that you need something of the form: y=a\left(e^{bx}+d\right)\cos(cx)+f 9 replies | 162 view(s) • May 2nd, 2018, 14:13 MarkFL replied to a thread Axioms of Integration in Calculus I've moved this thread to our "Calculus" forum as I assume we are discussing integral calculus. :) 5 replies | 179 view(s) • May 2nd, 2018, 14:07 Here is this week's POTW: A fire helicopter carries a bucket of mass$m\$ at the end of a cable. Flying back from a fire with an empty bucket at...
1 replies | 103 view(s)
• May 2nd, 2018, 14:05
Congratulations to the following members for their correct submission: kaliprasad My solution is as follows (kaliprasad used the same...
1 replies | 139 view(s)
• May 1st, 2018, 21:55
MarkFL replied to a thread Visible Stickies in vBulletin Products
Update - Version 1.1 Fixed bug regarding soft deleted/moderated sticky threads being visible to non-moderators.
2 replies | 320 view(s)
• April 28th, 2018, 15:52
Hello MHB! (Wave) Up until now, when you create a live Desmos Calculator, the only things saved are your viewport dimensions and expressions. We...
1 replies | 120 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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About Albert

#### Basic Information

##### About Albert
Interests:
math,program,literature,music
Occupation:
math teacher
Country Flag:
Taiwan

#### Signature

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

#### Statistics

Total Posts
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##### Thanks Data
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##### Visitor Messages
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Most Recent Message
June 16th, 2014 23:06
##### General Information
Last Activity
February 21st, 2018 23:41
Last Visit
February 3rd, 2018 at 00:14
Last Post
September 25th, 2017 at 07:34
Join Date
January 25th, 2013
Referrer
anemone
Referrals
1
Referred Members
brat

### 9 Friends

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Paris la ville de l'amour

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Pessimist Singularitarian

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زيد اليافعي

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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: