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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...

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3 replies | 78 view(s)
May 22nd, 2018, 14:03

MarkFL replied to a thread Help with CNF in Discrete Mathematics, Set Theory, and Logic

Here's the image you tried to hotlilnk:

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4 replies | 97 view(s)
May 22nd, 2018, 00:46

MarkFL replied to a thread Solve this please in Pre-Algebra and Algebra

I would take Greg's advice and write: 5\sqrt{2}\pm7=(b\sqrt{2}\pm a)^3=\pm...

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5 replies | 146 view(s)
May 20th, 2018, 23:49

MarkFL replied to a thread What is a little 2 in the lower right hand corner? in Pre-Algebra and Algebra

Where does "it" say that?

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11 replies | 17728 view(s)
May 16th, 2018, 20:53

MarkFL replied to a thread Jokes in Chat Room

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175 replies | 24424 view(s)
May 14th, 2018, 23:15

MarkFL replied to a thread [ASK] Fraction Addition with Arithmetic Series as Denominators in Pre-Algebra and Algebra

We know: \sum_{k=1}^n(k)=\frac{n(n+1)}{2} And so the given series becomes: ...

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1 replies | 91 view(s)
May 12th, 2018, 09:10

MarkFL replied to a thread Greetings from Scotland in Introductions

He posted a question in one of my vB product threads, which leads me to believe he may run his own site.

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7 replies | 250 view(s)
May 11th, 2018, 19:31

MarkFL replied to a thread Greetings from Scotland in Introductions

Do you own/admin your own site?

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7 replies | 250 view(s)
May 11th, 2018, 11:53

MarkFL replied to a thread Greetings from Scotland in Introductions

Hello, and welcome to MHB! (Wave)

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7 replies | 250 view(s)
May 11th, 2018, 11:34

MarkFL replied to a thread Force Read Thread Addon in vBulletin Products

That would require another product, as that's not what this product is intended for. :)

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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. :)

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5 replies | 142 view(s)
May 9th, 2018, 03:00

MarkFL replied to a thread Mixing with a Common Drain - page 537 #46 in Fundamentals of Differential Equations and BVP by Nagle in Differential Equations

Yes, I get equivalent results. (Yes)

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6 replies | 283 view(s)
May 9th, 2018, 00:32

MarkFL replied to a thread Mixing with a Common Drain - page 537 #46 in Fundamentals of Differential Equations and BVP by Nagle in Differential Equations

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...

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6 replies | 283 view(s)
May 8th, 2018, 21:48

MarkFL replied to a thread Hi in Introductions

Hello! Glad you found us. (Wave)

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3 replies | 161 view(s)
May 8th, 2018, 21:44

MarkFL replied to a thread Mixing with a Common Drain - page 537 #46 in Fundamentals of Differential Equations and BVP by Nagle in Differential Equations

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:

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6 replies | 283 view(s)
May 8th, 2018, 09:48

MarkFL replied to a thread Using constants in expressions. in Computer Science

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...

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10 replies | 623 view(s)
May 8th, 2018, 09:26

MarkFL replied to a thread Using constants in expressions. in Computer Science

The post was put into the moderation queue because a new user "necroposted." I have just approved the post.

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10 replies | 623 view(s)
May 6th, 2018, 11:24

MarkFL replied to a thread How create a composite damped periodic function that effectively models attached image? in Pre-Algebra and Algebra

All the assumptions were posted.

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9 replies | 162 view(s)
May 5th, 2018, 19:28

MarkFL replied to a thread Tangent to parametric curve in Calculus

I would speak to the professor to see what's up with that question. :)

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4 replies | 132 view(s)
May 5th, 2018, 13:08

MarkFL replied to a thread Tangent to parametric curve in Calculus

advanced:...

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4 replies | 132 view(s)
May 5th, 2018, 11:35

MarkFL replied to a thread Tangent to parametric curve in Calculus

The slope of the line can be found from: ...

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4 replies | 132 view(s)
May 4th, 2018, 22:28

MarkFL replied to a thread How create a composite damped periodic function that effectively models attached image? in Pre-Algebra and Algebra

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: ...

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9 replies | 162 view(s)
May 4th, 2018, 21:07

MarkFL replied to a thread How create a composite damped periodic function that effectively models attached image? in Pre-Algebra and Algebra

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?

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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?

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6 replies | 194 view(s)
May 3rd, 2018, 21:27

MarkFL replied to a thread How create a composite damped periodic function that effectively models attached image? in Pre-Algebra and Algebra

It appears to me that you need something of the form: y=a\left(e^{bx}+d\right)\cos(cx)+f

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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. :)

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5 replies | 179 view(s)
May 2nd, 2018, 14:07

MarkFL started a thread Problem Of The Week #312 May 2nd, 2018 in POTW for Secondary School/High School Students

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...

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1 replies | 103 view(s)
May 2nd, 2018, 14:05

MarkFL replied to a thread Problem Of The Week #311 Apr 26th, 2018 in POTW for Secondary School/High School Students

Congratulations to the following members for their correct submission: kaliprasad My solution is as follows (kaliprasad used the same...

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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.

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2 replies | 320 view(s)
April 28th, 2018, 15:52

MarkFL started a thread Improvement To Desmos API (Embedded Live Calculators) in Announcements

Hello MHB! (Wave) Up until now, when you create a live Desmos Calculator, the only things saved are your viewport dimensions and expressions. We...

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1 replies | 120 view(s)
April 27th, 2018, 10:29

MarkFL replied to a thread Find the value of the iterated integral in Calculus

Hello and welcome to MHB! :D We ask that our users show their progress (work thus far or thoughts on how to begin) when posting questions. This...

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2 replies | 126 view(s)
April 26th, 2018, 10:41

MarkFL started a thread Problem Of The Week #311 Apr 26th, 2018 in POTW for Secondary School/High School Students

Here is this week's POTW: A charge $-q_1$ is located at the origin of a $y$-axis and a charge $-q_2$ is located at $y=d$. At what point along...

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1 replies | 139 view(s)
April 26th, 2018, 10:40

MarkFL replied to a thread Problem Of The Week #310 Apr 20th, 2018 in POTW for Secondary School/High School Students

Congratulations to the following members for their correct submission: kaliprasad My solution is as follows: For the entire system...

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1 replies | 111 view(s)

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We are an online community that gives free mathematics help any time of the day about any problem, no matter what the level. You will have to register before you can post. To start viewing messages, select the forum that you want to visit from the selection below.

MarkFL Pessimist Singularitarian MHB AdministratorMHB CoderMHB Math HelperMHB Ambassador

Mini Statistics

Statistics

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Thanks Data

Visitor Messages

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May 25th, 2018

May 24th, 2018

May 23rd, 2018

MarkFL

Pessimist Singularitarian

MHB Administrator
MHB Coder
MHB Math Helper
MHB Ambassador