View Profile: MarkFL - Math Help Boards

Yesterday, 22:22

MarkFL replied to a thread 2.1.9 Find the general solution of the given differential equation in Differential Equations

Here's a link to a Desmos slope field for this ODE: https://www.desmos.com/calculator/my0rwuxl5x

3 replies | 71 view(s)

Yesterday, 00:37

MarkFL replied to a thread 2.1.9 Find the general solution of the given differential equation in Differential Equations

When you determine your integrating factor, you need only determine up to but not including the constant of integration: ...

3 replies | 71 view(s)

February 19th, 2019, 20:32

MarkFL replied to a thread [SOLVED] de1.3.19 Determine the values of r for DE in Differential Equations

There are some typos/issues with your work. See if you can spot them...:)

4 replies | 84 view(s)

February 19th, 2019, 15:41

MarkFL replied to a thread [SOLVED] de1.3.19 Determine the values of r for DE in Differential Equations

Okay, if we are to consider a solution of the form: y=t^r Then: y'=rt^{r-1} y''=r(r-1)t^{r-2}

4 replies | 84 view(s)

February 19th, 2019, 10:27

MarkFL replied to a thread Welcome New MHB Math Helper steenis! in Announcements

Congratulations, and welcome to the team! (Yes)

4 replies | 85 view(s)

February 19th, 2019, 00:00

MarkFL replied to a thread Radicals and Radical Equations in Pre-Algebra and Algebra

Let's try \(x=5\): \sqrt{5-1}=5-7 2=-2 Is this true?

4 replies | 77 view(s)

February 18th, 2019, 23:57

MarkFL started a thread Permissions for User Ignore System in vBulletin Products

Overview: This product is designed to allow you to specify which usergroups will have access to the user ignore system. Users who are not a member...

0 replies | 49 view(s)

February 18th, 2019, 22:42

MarkFL replied to a thread Radicals and Radical Equations in Pre-Algebra and Algebra

What do you get when you substitute each potential solution into the original equation?

4 replies | 77 view(s)

February 18th, 2019, 20:22

MarkFL replied to a thread Starred Posts in vBulletin Products

I've installed this product on many vB sites without issue. As I said in another thread, I really recommend that you upgrade your vB. It's very old....

4 replies | 770 view(s)

February 18th, 2019, 20:18

MarkFL replied to a thread Forum Marquee in vBulletin Products

Please send me the login credentials by PM to an admin account on your site, and I will see if I can figure out what the issue on your site is. You...

2 replies | 569 view(s)

February 15th, 2019, 17:10

MarkFL replied to a thread guessing a three digit pin code from an 8 key keypad in Basic Probability and Statistics

How many PIN codes are possible...can you apply the fundamental counting principle to answer this question?

2 replies | 217 view(s)

February 13th, 2019, 00:02

MarkFL replied to a thread Career Change in Chat Room

Good luck, Adrian! I've had family members as well as myself receive care at the Mayo Clinic in Jacksonville and St. Augustine here in Florida. They...

6 replies | 163 view(s)

February 10th, 2019, 23:33

MarkFL replied to a thread Kinematics + Trigonometry Application (Physics 12u) in Physics

We could set: y(t)=-\frac{g}{2}t^2+v_0\sin(\theta)t=0 Let's multiply by -2: gt^2-2v_0\sin(\theta)t=0 Now, for the quadratic formula, we...

16 replies | 299 view(s)

February 10th, 2019, 23:07

MarkFL replied to a thread Kinematics + Trigonometry Application (Physics 12u) in Physics

Yes, that's correct. :)

16 replies | 299 view(s)

February 10th, 2019, 22:45

MarkFL replied to a thread Kinematics + Trigonometry Application (Physics 12u) in Physics

We will assume that \frac{v_0^2}{g} is some constant, and only worry about the factor that is a function of \(\theta\). Since it is in the numerator,...

16 replies | 299 view(s)

February 10th, 2019, 17:24

MarkFL replied to a thread Kinematics + Trigonometry Application (Physics 12u) in Physics

Let's find the root we want: 2v_0\sin(\theta)-gt=0\implies t=\frac{2v_0\sin(\theta)}{g} And so the range of the projectile is: ...

16 replies | 299 view(s)

February 9th, 2019, 23:58

MarkFL replied to a thread Kinematics + Trigonometry Application (Physics 12u) in Physics

What you will obtain is the range in terms of the parameters \(v_0\) and \(\theta\). And then you will need to demonstrate that for some positive...

16 replies | 299 view(s)

February 9th, 2019, 20:13

MarkFL replied to a thread Kinematics + Trigonometry Application (Physics 12u) in Physics

I factored \(y(t)\) so you could more easily determine the roots. We see that one root is \(t=0\), and that corresponds to the moment when the...

16 replies | 299 view(s)

February 9th, 2019, 01:06

MarkFL replied to a thread Kinematics + Trigonometry Application (Physics 12u) in Physics

I would begin with velocity, with our coordinate axes oriented such that the initial position of the projectile is at the origin, and observe we are...

16 replies | 299 view(s)

February 9th, 2019, 00:17

MarkFL replied to a thread Kinematics + Trigonometry Application (Physics 12u) in Physics

Can you show what you have so far?

16 replies | 299 view(s)

February 7th, 2019, 12:56

MarkFL replied to a thread Percentage between two numbers in Other Topics

Suppose you have two real numbers \(x_1\) and \(x_2\) with \(x_1<x_2\). And we want to find a third number \(x_p\) that is a part \(p\) (where \(0\le...

2 replies | 170 view(s)

February 5th, 2019, 14:36

MarkFL replied to a thread Welcome New MHB Math Helper Country Boy! in Announcements

Congratulations on a well deserved promotion, and welcome to the team! (Yes)

4 replies | 245 view(s)

February 1st, 2019, 02:16

MarkFL replied to a thread Log in in Questions, Comments, and Feedback

I just now had a user on another site running the same version of vB that we're running here complain of the same issue. I'm not having this issue on...

12 replies | 462 view(s)

January 31st, 2019, 14:10

MarkFL replied to a thread Log in in Questions, Comments, and Feedback

There have been no recent changes that would affect that as far as I know. Did you change browsers, or make a change to your browser such that it...

12 replies | 462 view(s)

January 30th, 2019, 16:56

MarkFL replied to a thread find the limit in Calculus

What I would do is write: L=\lim_{n\to\infty}\left(\left(2-2^{\frac{1}{n+1}}\right)^n\right) And this implies: ...

2 replies | 102 view(s)

January 29th, 2019, 15:23

MarkFL replied to a thread expression with sin and cos in Trigonometry

If you divide the numerator and denominator by \(\sin^n(x)\) what do you get?

2 replies | 133 view(s)

January 29th, 2019, 15:09

MarkFL replied to a thread Limit with x in both base and exponenet in Calculus

I would first write: L=\lim_{x\to0}\left(\left(e^{ax}+x\right)^{\frac{1}{x}}\right) Next, take the natural log of both sides, and simplify to...

1 replies | 101 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

General Information

February 22nd, 2019

February 21st, 2019

February 20th, 2019

February 19th, 2019

MarkFL

Pessimist Singularitarian

MHB Administrator
MHB Coder
MHB Math Helper
MHB Ambassador