• 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,...
5 replies | 36 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...
4 replies | 33 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...
4 replies | 33 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)
7 replies | 214 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 | 37 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, 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 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 | 166 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 | 166 view(s)
• August 16th, 2017, 22:42
Overview: This product is designed to auto-post a welcome thread for all new users once they have completed all verifications, and/or returning...
0 replies | 28 view(s)
• August 16th, 2017, 21:58
Isn't this question a duplicate of the following? 231.12.3.65 Determine the smallest distance between a point and a line
1 replies | 43 view(s)
• August 16th, 2017, 17:25
Hey freedomdorm! I saw you posted this update on to another question so I gave you your own thread. Are you curious about the other question or do...
1 replies | 44 view(s)
• August 14th, 2017, 01:09
MarkFL replied to a thread Solar Eclipse 2017 in Chat Room
I was just reading about how tree leaves can form "pinhole cameras" and the eclipse can be seen in their shadows:
7 replies | 214 view(s)
• August 13th, 2017, 14:03
MarkFL replied to a thread [SOLVED] 12 DeMoivre's theorem in Trigonometry
In case you're wondering how I obtained the following factorizations: 1+3i=(1+i)(2+i) 2-2i=-(1+i)^3 What I did for the first was to write: ...
13 replies | 265 view(s)
• August 13th, 2017, 10:34
Hey RTCNC, I do agree that this question is similar to the one you asked yesterday, so for me that only highlights the fact that you should work...
3 replies | 88 view(s)
• August 13th, 2017, 10:15
MarkFL replied to a thread [SOLVED] 12 DeMoivre's theorem in Trigonometry
What definition for "complex form" were you given? That was the confusing issue for me. I am aware of rectangular, polar and exponential forms for...
13 replies | 265 view(s)
• August 12th, 2017, 22:07
MarkFL replied to a thread [SOLVED] 12 DeMoivre's theorem in Trigonometry
I'm wondering if what we're supposed to do here is: 1+3i=(1+i)(2+i) 2-2i=-(1+i)^3 And so the product is: ...
13 replies | 265 view(s)
• August 12th, 2017, 15:44
Well my questions still stand and I'm curious how you came up with this RTCNTC? :) There is a way to write the solution in terms of combinations,...
7 replies | 165 view(s)
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### 28 Visitor Messages

1. Hello and welcome back to MHB, Fernando Revilla!

We are happy to see that you have returned, and we look forward to your continued participation here!

On Behalf Of MHB's Staff,

Jameson.
2. Hello and welcome back to MHB, Fernando Revilla!

We are happy to see that you have returned, and we look forward to your continued participation here!

On Behalf Of MHB's Staff,

Jameson.
3. Welcome back, Fernando! Glad to see you've rejoined the party!
4. Woow , it's been a while. Welcome back
5. Welcome back, Fernando!
6. Hey! There you are! I was wondering if you'd be back. We missed you!
7. Hey Fernando, nice to see you back!
8. Congratulations on the 500 post mark! It's great that you've been so active this year Looking forward to the next 500 posts.
9. hola profesor fernando que pena escribir en español pero no se ingles, queria saber si usted conoce alguna aplicacion de las integrales sin(x*x*x*x), he desarrollado un metodo numerico para calcularlas en cualquier valor comprendido en el intervalo de (4,infinito) y mi abogado me dice que tengo que encontrar una aplicacion para poder proteger y blindar de una forma mas segura los derechos de autor, estare pendiente de su respuesta, o si conoce a alguien que me pueda ayudar le agradeceria enormemente, gracias.

hello fernando teacher wanted to know if you know any application of the integral sin (x * x * x * x), I have developed a numerical method to calculate any value in the interval (4, infinity) and my lawyer tells me I have to find an application in order to protect and shield in a more secure copyright, I will be aware of your answer, or if you know someone who can help me I would appreciate greatly, thanks.

att
jefferson alexander vitola
10. LOL! Nicely put!
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#### Basic Information

Biography:
Prof. of Mathematical Methods, Univ. Alfonso X El Sabio, Madrid.
(Up until the 2008/2009 academic year. I am now devoted to investigation).
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