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• Today, 03:13
Here is this week's POTW: ----- Find the exact value for the real root of the equation $x^3+3x-2=0$. ----- Remember to read the POTW...
0 replies | 27 view(s)
• Today, 02:59
Congratulations to the following members for their correct solution::) 1. kaliprasad 2. lfdahl Honorable mention goes to cmath123, as he has his...
1 replies | 107 view(s)
• Yesterday, 20:12
Yes. $$= = = 1$$
3 replies | 46 view(s)
• Yesterday, 19:34
Hi FallArk! The $$notation indicates the floor function. That is, rounding down to the nearest integer below x. Btw, I prefer the notation... 3 replies | 46 view(s) • Yesterday, 17:49 I like Serena replied to a thread [SOLVED] How to prove continuity? in Analysis Hi FallArk! ;) Let's take the definition of continuity into account:$$\lim_{x\to c} f(x) = f(c) \ne 0 This means that for any $\epsilon>0$...
4 replies | 59 view(s)
• Yesterday, 02:29
MarkFL replied to a thread 231.14.88 3d surface in Calculus
Multiplying through by $9+6x-8y$ and distributing the $26$, we obtain -x^2-y^2+z^2=156x-208y+234 -x^2-156x-y^2+208y+z^2=234 ...
3 replies | 53 view(s)
• February 17th, 2017, 17:44
Simplex yes. And no, we didn't need to figure out the configurations - they were given. At best it helps a bit to understand the problem statement....
11 replies | 126 view(s)
• February 17th, 2017, 16:05
Looks good. Does that mean that we're done? (Wondering)
11 replies | 126 view(s)
• February 17th, 2017, 15:20
Yes and yes. What would the objective function be? (Wondering)
11 replies | 126 view(s)
• February 17th, 2017, 14:11
Yes and yes. How many plates A and B do we need? (Thinking)
11 replies | 126 view(s)
• February 17th, 2017, 01:20
Can't we fit another 300x700 in the scrap at the right of size 300x1000? (Wondering)
11 replies | 126 view(s)
• February 16th, 2017, 09:40
Variation on Ifdahl's solution: Let $y = x + \frac1x$. Then $\bigl(\sqrt{y+1} + \sqrt y\bigr)\bigl(\sqrt{y+1} - \sqrt y\bigr) = y+1-y = 1$....
3 replies | 123 view(s)
• February 15th, 2017, 20:29
You have two points on the graph, so you can compute the slope as follows: m=\frac{\Delta y}{\Delta x}=\frac{y_2-y_1}{x_2-x_1} Then, you can...
2 replies | 58 view(s)
• February 15th, 2017, 00:27
I like Serena replied to a thread [SOLVED] Tests in Advanced Probability and Statistics
That looks correct yes. (Nod)
16 replies | 174 view(s)
• February 14th, 2017, 23:47
Yes, the derivative of the function evaluated at the $x$-coordinate of the tangent point will give you the slope $m$ of the tangent line. :)
4 replies | 89 view(s)
• February 14th, 2017, 23:18
The first derivative of a function gives you the slope of the tangent line, not the tangent line itself. Thus,for some function $f(x)$, the tangent...
4 replies | 89 view(s)
• February 14th, 2017, 22:17
Let's try your substitution of: u=x+9\implies du=dx I=\int_9^{18}\frac{(u-9)^3}{u^2}\,du By the binomial theorem: ...
1 replies | 47 view(s)
• February 14th, 2017, 18:27
Okay, I see what you are doing now. Yes, you can do it but I find it to be a bit confusing since you are (temporarily) giving x a value. Since you...
3 replies | 63 view(s)
• February 14th, 2017, 18:15
I like Serena replied to a thread [SOLVED] Tests in Advanced Probability and Statistics
We need another section on that same page where it says unequal variances... (Thinking)
16 replies | 174 view(s)
• February 14th, 2017, 17:48
I like Serena replied to a thread [SOLVED] Tests in Advanced Probability and Statistics
Hmm... that table gives $F^*=1.03$ for $\alpha=0.05$, $DF_1 > 1000$, and $DF_2 > 1000$. And we had $F=1.19$, so that implies we need to assume...
16 replies | 174 view(s)
• February 14th, 2017, 17:37
I like Serena replied to a thread [SOLVED] Tests in Advanced Probability and Statistics
That looks as if it's about the degrees of freedom for the t-test we're going to do. And that depends on whether we're going to do the t-test with...
16 replies | 174 view(s)
• February 14th, 2017, 17:31
For the record, this is what the distributions look like when trying to determine $\beta$. \begin{tikzpicture} \pgfmathdeclarefunction{gauss}{3}{%...
13 replies | 142 view(s)
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