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• Today, 17:57
When I throw it at Octave online, I get: So it seems it is none of the above, but the answer $3$ is close. For reference, I have re-encoded...
1 replies | 30 view(s)
• Today, 14:20
Let $f:\mathbb R\to \mathbb R$ be a twice-differentiable function such that $f(x)+f^{\prime\prime}(x)=-x|\sin(x)|f'(x)$ for $x\geq 0$. Assume that...
1 replies | 30 view(s)
• Yesterday, 16:46
This should be fairly simple, convert 360 degrees in 18 minutes to x degrees in 1 minute. The graph shows height of a capsule above the ground in...
2 replies | 43 view(s)
• Yesterday, 12:06
Hi all, I think even we do switch to XF (is still going to happen) the time has come to make a change. We have a database of amazing content here...
1 replies | 108 view(s)
• Yesterday, 11:37
Hi all, I hope you are all safe, healthy, and not affected in a serious way by the world wide COVID-19 virus. Here in the US it has completely...
0 replies | 47 view(s)
• Yesterday, 11:34
Hey mathmari!! This is an example where Newton-Raphson can have problems if we are not careful. If we pick a starting value that is too far from...
2 replies | 41 view(s)
• Yesterday, 11:33
skeeter replied to a thread [SOLVED] Transportation calculus in Pre-Algebra and Algebra
that's my mistake ... should be 14.9. I doubled the numerator and denominator to get the coefficient of $n$ to be 1 instead of 0.5. When I decided...
10 replies | 355 view(s)
• Yesterday, 10:30
\frac{\left(x\sin\left(\pi\left(x-1\right)\right)\right)}{e^{x/9}(x-1)} The above graph shows that the function repeats its value at $x=1$ when $x$...
2 replies | 41 view(s)
• Yesterday, 09:09
skeeter replied to a thread [SOLVED] Transportation calculus in Pre-Algebra and Algebra
what does n-1 represent? in the equation I wrote in post #4, $n$ represents the number of additional freight loads
10 replies | 355 view(s)
• April 5th, 2020, 10:58
skeeter replied to a thread [SOLVED] Transportation calculus in Pre-Algebra and Algebra
I have a better idea ... explain how you derived your function.
10 replies | 355 view(s)
• April 5th, 2020, 10:37
I substituted $n=\frac 1{x^2}$, which also means that $x^2=\frac 1 n$. So we get $\Big(1 + \frac 32 x^2\Big)^{1/x^2} = \Big(1 + \frac 32 \cdot \frac... 7 replies | 232 view(s) • April 5th, 2020, 09:14 It's like this: $$\Big(1-\frac 12 x^2 + \ldots\Big)\Big(1+\frac 12 (2x)^2 - \ldots\Big)\\ =1\cdot 1 -\frac 12 x^2 \cdot 1+1\cdot \frac 12 (2x)^2 -... 7 replies | 232 view(s) • April 5th, 2020, 07:04 The series expansion of \cos x = 1 - \frac 12x^2 + \ldots. And the expansion of \frac 1{1-x} = 1+x+x^2+\ldots So:$$\frac{\cos(x)}{\cos(2x)}... 7 replies | 232 view(s) • April 5th, 2020, 01:08 Here is this week's POTW: ----- Suppose that the positive integers$x, y$satisfy$2x^2+x=3y^2+y$. Show that$x-y, 2x+2y+1, 3x+3y+1$are all... 0 replies | 180 view(s) • April 5th, 2020, 01:02 No one answered last week's POTW.(Sadface) Below is a suggested solution: The given function is the square of the distance between a point of the... 1 replies | 147 view(s) • April 4th, 2020, 12:16 skeeter replied to a thread [SOLVED] Transportation calculus in Pre-Algebra and Algebra simplified the initial cost function ...$C(v) = 1375\left(\dfrac{44.5}{v} + \dfrac{14.9}{180-v}\right)$minimum cost occurs at$v \approx 114...
10 replies | 355 view(s)
• April 4th, 2020, 09:26
skeeter replied to a thread [SOLVED] 299What is the acceleration in Calculus
$v(t) = \cos{t}+\sin{t} \implies a(t) = \cos{t}-\sin{t} \implies a\left(\dfrac{3\pi}{4}\right) = -\sqrt{2}$
4 replies | 274 view(s)
• April 4th, 2020, 04:14
This is actually a proof of (ii) $\Rightarrow$ (iii) in Lemma 3.2. So we are assuming that (ii) holds. In particular, since $\overline{ f(A) }$ is...
1 replies | 194 view(s)
• April 3rd, 2020, 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 | 250 view(s)
• April 3rd, 2020, 10:39
skeeter replied to a thread [SOLVED] Transportation calculus in Pre-Algebra and Algebra
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...
10 replies | 355 view(s)
• April 2nd, 2020, 17:07
skeeter replied to a thread f in Calculus
don't know math ... ?
5 replies | 303 view(s)
• April 2nd, 2020, 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 | 213 view(s)
• April 2nd, 2020, 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 | 303 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 | 250 view(s)
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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

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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?
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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
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