Tab Content
• Today, 15:47
I have obtained access to the full solutions manual, after contacting Wiley about it. I will not type up the solution in full, but simply note a few...
1 replies | 72 view(s)
• Today, 10:39
What are your units for speed, the $x$ in your cost function? I get cost as a function of speed, $v$, in km/hr ... $C(v) = 1375 \bigg$ unit...
2 replies | 65 view(s)
• Yesterday, 17:07
skeeter replied to a thread f in Calculus
don't know math ... ?
5 replies | 119 view(s)
• Yesterday, 15:47
In the mid-1990's, an electrical engineer/computer scientist by the name of Judea Pearl started to change the world by greatly improving our...
0 replies | 41 view(s)
• Yesterday, 12:25
Klaas van Aarsen replied to a thread f in Calculus
It appears the answer is: dkm Acronym for "don't kill me". Often used when somebody says something that somebody else finds really funny,...
5 replies | 119 view(s)
• April 1st, 2020, 15:04
$\newcommand{\doop}{\operatorname{do}}$ Problem: (This is from Study question 4.3.1 from Causal Inference in Statistics: A Primer, by Pearl,...
1 replies | 72 view(s)
• April 1st, 2020, 06:35
Not quite, although you started correctly. The limit in this case is as $x\to\infty$, so you want to see what happens when $x$ gets large. This means...
3 replies | 104 view(s)
• March 31st, 2020, 19:28
why did you do that? ... ... if originally, $x = \sin{t}-\cos{t}$, then $v = \cos{t} + \sin{t} = 0 \implies t = \dfrac{3\pi}{4}$
2 replies | 71 view(s)
• March 31st, 2020, 14:52
Hi Goody, and welcome to MHB! To prove that \lim_{x\to\infty}\frac{x-1}{x+2} = 1, you have to show that, given $\varepsilon > 0$, you can find $N$...
3 replies | 104 view(s)
• March 30th, 2020, 05:31
Let's take a look at a couple of examples. If $f(x)=x$, then $f'(x)=1$ and $f''(x)=0$. So $\lim\limits_{x\to +\infty}f'(x)\ne 0$, isn't it?...
21 replies | 338 view(s)
• March 30th, 2020, 04:26
Yep. (Nod) And no, nothing more specific.
21 replies | 338 view(s)
• March 30th, 2020, 03:32
I believe so yes. Consider $f(x)=\ell$. It satisfies all conditions, doesn't it? (Wondering) And it is monotone instead of strictly monotone. To...
21 replies | 338 view(s)
• March 29th, 2020, 14:38
Indeed. (Thinking)
21 replies | 338 view(s)
• March 29th, 2020, 14:26
Yep. (Nod)
21 replies | 338 view(s)
• March 29th, 2020, 13:57
Then the inequality also holds yes. What if fill in, say, $f'(y)=-1$ in the inequality? Would it satisfy it? (Wondering)
21 replies | 338 view(s)
• March 29th, 2020, 13:19
That is a possibility yes. What happens if $f'(y)$ is negative? (Wondering)
21 replies | 338 view(s)
• March 29th, 2020, 13:08
We have an expression with $f(y)$, $f'(y)$, and $\ell$. And we already know that $\ell\in\mathbb R$, don't we? So it can't be $\pm\infty$ either. ...
21 replies | 338 view(s)
• March 29th, 2020, 12:27
similar problem from another site had $f(x^2-2016x) = f(x) \cdot x + 2016$ https://mathhelpforum.com/threads/functions-problem.285171/#post-954658...
2 replies | 152 view(s)
• March 29th, 2020, 10:27
Ah okay. But that is not the case now is it? (Wondering) Sounds like a plan. (Nod)
21 replies | 338 view(s)
• March 29th, 2020, 08:35
Let's see, suppose we pick a convex function, say $f(x)=x^2$. It's convex isn't it? Does $\lim\limits_{x\to +\infty}f'(x)$ exist? (Wondering) ...
21 replies | 338 view(s)
• March 29th, 2020, 07:38
Hey mathmari!! Let's start with: It follows from $\lim\limits_{x\rightarrow +\infty}f(x)=\ell$ that $\lim\limits_{x\to +\infty}f'(x)=0$...
21 replies | 338 view(s)
• March 27th, 2020, 23:42
Here is this week's POTW: ----- Find the minimum value of $(u-v)^2+\left(\sqrt{2-u^2}-\dfrac{9}{v}\right)^2$ for $0<u<\sqrt{2}$ and $v>0$. ...
0 replies | 97 view(s)
• March 27th, 2020, 23:38
Hi MHB! I have decided to extend the deadline by another week so that our members can give this problem another shot and I am looking forward to...
1 replies | 212 view(s)
• March 27th, 2020, 18:40
skeeter replied to a thread 3.6.26 mvt in Calculus
average rate of change of $f(x)$ on the interval  is $\dfrac{f(8)-f(2)}{8-2}$ the MVT states there exists at least one value of $x \in (2,8)$...
1 replies | 103 view(s)
• March 27th, 2020, 09:04
skeeter replied to a thread speed of a light beam in Calculus
$\dfrac{d\theta}{dt}$ = 5 rpm = $\dfrac{10\pi}{60 \, sec} = \dfrac{\pi}{6}$ rad/sec consider the right triangle formed by the light beam, the...
1 replies | 74 view(s)
• March 25th, 2020, 17:42
Yep. (Nod) I'd say 'and this is confirmed...' rather than 'since this is confimed...' though. (Emo)
12 replies | 357 view(s)
More Activity

### 145 Visitor Messages

1. Hi
I've a question if you could help me with it, i'd be happy.

Question:
Expand and simplify the following set of brackets: f(x)=(x+2)(x+4)(x+1)

f(x)= ............ X3+………….. X2+…………………. X+11

regards
John
2. Thank you very much for the kind "Welcome" !!!
3. Hi. Thanks for the welcome. This is my first ever involvement in a forum. Not sure about the thread thing. I got a message when i first signed up that i had to reply to a thread before i posted my own? True?
4. thank you for the message I had a question regarding this website. how long does it usually take to get a response to something
5. Not to sure where to start. I have say a wire frame with 4 O/S perimeter measurements (measurements not even and is not square) 2 diagonal measurements 2 opposite points are low and the other 2 are higher I dont have the heights. My problem is I would like to find the centroid point and have the 4 new diagonal measurements to fill this in with 4 triangles of material. I want to do the Calculations in a spreadsheet as the measurements could change I think first off I need to work out the height ,work out all the horizontal measurements,work out the centroid of that then half the height and do the Pythagoras from that. I can give you my measurements that I have made up. Ive tried to do the maths in excel by flattening and find out the new bd using ac diagonal and finding the new ac using bd measurements but I was getting 2 different heights not by much 13 mm I know why but got lost. Hope you can understand where I going with this. This problem has been bugging me for years. Allan
6. how do I post my own problem I need help with?
7. Hi,

I need help for below solution

The height in inches of 10 students selected at random are as follows
61 62 62 65 66 67 68 69 69 70

on the basis of this figures is it correct to conclude that the mean height of students is 68 inches?
8. Thank you!
9. also can u pls suggest important questions of maths for class 12 2018 board for maths
10. sir i have a doubt in chapter 1 relations and functions example 23,24,25 of class 12 .please solve them boards are approaching
Showing Visitor Messages 1 to 10 of 145
Page 1 of 15 12311 ... Last
Page 1 of 15 12311 ... Last

Country Flag:
Malaysia

#### Statistics

Total Posts
3,328
Posts Per Day
1.12
Thanks Given
20,009
9,575
2.877
##### Visitor Messages
Total Messages
145
Most Recent Message
October 5th, 2019 14:40
##### General Information
Last Activity
Today 22:17
Last Visit
Today at 21:18
Last Post
March 27th, 2020 at 23:42
Join Date
February 14th, 2012
Referrals
3
Referred Members
Albert, einsnul, MarkFL

### 28 Friends

1. #### AckbachOffline

Indicium Physicus

MHB Master

3. #### awkwardOffline

MHB Apprentice

4. #### bwpbruceOffline

MHB Apprentice

5. #### caffeinemachineOffline

MHB Journeyman

6. #### Chris L T521Offline

MHB Journeyman

MHB Master

8. #### DreamWeaverOffline

MHB Craftsman

9. #### FarmtalkOffline

MHB Apprentice

10. #### Fernando RevillaOffline

MHB Journeyman

Showing Friends 1 to 10 of 28
Page 1 of 3 123 Last
Page 1 of 2 12 Last

#### April 3rd, 2020

• 11:52 - anemone clicked Thanks for this post: -= Hidden Content =- by Ackbach

#### April 1st, 2020

• 14:57 - Ackbach clicked Thanks for this post: -= Hidden Content =- by anemone

#### March 17th, 2020

• 21:09 - anemone clicked Thanks for this post: -= Hidden Content =- by lfdahl

Page 1 of 2 12 Last
Ranks Showcase - 8 Ranks
Icon Image Description

Name: MHB Challenges Award (2016)
 Issue time: January 9th, 2017 14:42 Issue reason:

Name: MHB Challenges Award (2015)
 Issue time: January 7th, 2016 11:11 Issue reason:

Name: MHB Best Ideas Award (2015)
 Issue time: January 7th, 2016 11:10 Issue reason:

Name: MHB Challenges Award (2014)
 Issue time: January 3rd, 2015 15:31 Issue reason:

Name: MHB Challenges Award (Jul-Dec 2013)
 Issue time: January 5th, 2014 16:56 Issue reason:

Name: MHB LaTeX Award (Jul-Dec 2013)
 Issue time: January 5th, 2014 16:52 Issue reason:

Name: Secondary School/High School POTW (Jul-Dec 2013)
 Issue time: January 5th, 2014 16:48 Issue reason:

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