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MarkFL
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Today,
12:36
MarkFL
replied to a thread
Range problem
in
Pre-Algebra and Algebra
I am going to assume that a "list range" is the difference between the largest and smallest elements in the list. So, if we assume then that we are...
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2 replies | 28 view(s)
Today,
02:42
MarkFL
replied to a thread
Is it possible?
in
Pre-Algebra and Algebra
If you are asking if it's possible to write this expression in the form $a+bi$, yes, it is: c=\frac{5-i}{i} Let's multiply this expression by...
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1 replies | 33 view(s)
Yesterday,
10:52
MarkFL
replied to a thread
ACT problem
in
Pre-Algebra and Algebra
Another approach would be: S=2\sum_{k=1}^{50}(k)=50\cdot51
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2 replies | 40 view(s)
January 20th, 2017,
11:54
MarkFL
replied to a thread
Differentiation challenge
in
Challenge Questions and Puzzles
We appreciate challenge problems of virtually any level of difficulty. My advice to everyone is that if you find a posted problem "too easy" to...
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7 replies | 188 view(s)
January 19th, 2017,
10:19
MarkFL
replied to a thread
Minimum of function under constraint
in
Calculus
Yes, the function as a whole is not bounded from below or from above. Let's look at this using Lagrange Multipliers... We have the objective...
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6 replies | 92 view(s)
January 18th, 2017,
22:47
MarkFL
replied to a thread
Minimum of function under constraint
in
Calculus
You also need to check the boundaries of the function, one of which is $x=0$, at which the function is discontinuous. Another way to find the range...
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6 replies | 92 view(s)
January 18th, 2017,
20:13
MarkFL
replied to a thread
Minimum of function under constraint
in
Calculus
The function: f(x)=\frac{36}{x}+x has 2 local extrema, but we need to also look at the range, which is $(-\infty,-6]\,\cup\,[6,\infty)$. You...
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6 replies | 92 view(s)
January 17th, 2017,
17:35
MarkFL
replied to a thread [SOLVED]
231.12.3.63 Determine the smallest distance between point P and the line L through the origin
in
Calculus
The square of the distance is: D^2=(x+8)^2+(6x-4)^2=37x^2-32x+80 Critical value is from: 74x-32=0\implies x=\frac{16}{37} ...
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2 replies | 63 view(s)
January 16th, 2017,
17:17
MarkFL
replied to a thread
Parabola question
in
Pre-Algebra and Algebra
Yes, that's what I got too. (Yes) So then, what is $y_{\min}$?
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5 replies | 104 view(s)
January 16th, 2017,
16:04
MarkFL
replied to a thread
Parabola question
in
Pre-Algebra and Algebra
We know the axis of symmetry for the general quadratic: f(x)=ax^2+bx+c is the line: x=-\frac{b}{2a} And so for the given function:
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5 replies | 104 view(s)
January 15th, 2017,
15:03
MarkFL
started a thread
Smilie Tabs: Easier Access To Smilies
in
Announcements
Hello MHB Community! (Wave) We have just installed a new feature that will make adding smilies to your posts easier and more efficient. When you...
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3 replies | 122 view(s)
January 15th, 2017,
10:59
MarkFL
replied to a thread
Prove that sin(x)+cos(x) is equal or larger than 1
in
Trigonometry
We could use Lagrange Multipliers...consider the objective function: f(x,y)=\sin(x)-\sin(y) Subject to the constraint: ...
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11 replies | 305 view(s)
January 12th, 2017,
23:20
MarkFL
replied to a thread
Site upgrade and planned downtime Wed, Jan 11
in
Announcements
Yes, when I got in tonight, I found Jameson had sent me the cure for the thanks issue. (Dance)
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13 replies | 344 view(s)
January 12th, 2017,
22:41
MarkFL
replied to a thread
Site upgrade and planned downtime Wed, Jan 11
in
Announcements
After an upgrade to the latest version of our thanks product, that is now functioning again. (Yes)
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13 replies | 344 view(s)
January 12th, 2017,
16:33
MarkFL
replied to a thread
cone
in
Calculus
The vessel into which the water is flowing has a radius that is one half the height. Any "cone of water" partially or completely filling the vessel...
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3 replies | 97 view(s)
January 12th, 2017,
16:11
MarkFL
replied to a thread
cone
in
Calculus
At any point in time, how are the radius and height of the "cone of water" within the conical vessel related?
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3 replies | 97 view(s)
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January 24th, 2017
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Re: Range problem
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List contains 1, square...
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Re: Debugging Codes!
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Generally speaking, I...
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Re: Range problem
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Hi alextrainer. Would...
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Re: Is it possible?
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If you are asking if...
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January 23rd, 2017
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Re: ACT problem
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Another approach would...
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It's an arithmetic...
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Re: Can anyone tell me the real names of these 3D shapes?
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The last two are prisms,...
January 22nd, 2017
22:08 -
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I hope Deveno returns to...
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Hello and welcome to...
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Re: Diagonalizable Matrix
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A matrix is...
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Wow! Thank you so much!...
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