Help me out sci, im studying for a Calc 3 test i have on friday and im having trouble with a problem from the textbook (pic related)
Find the Value of the triple integral;
[math]\iiint\limits_E \,xy \mathrf{d} V\ [/math]
(my latex may suck, its the triple integral of (xy)dV on the region E). Where E is the pholyedron with vertex (0,0,0) (1,0,0) (0,2,0) and (0,0,3).
The problem im having is that the solution on the textbook is (8/3e). i really dont know how you could end up with e on the result.
thank for your help guys.
>>7793227
latex didnt went so bad, just ignore the red part.
>>7793227
oh and btw, what i did was the iterated integral where:
0<x<1
0<y<2-2x
0<z<3-(3y/2)-3x
[math]\sum_{n=0}^\infty \frac 1 {n!} = e[/math]
Hi /sci/, I need some help with choosing a sorting algorithm for a website I'm coding. /g/wdg/ is useless and keeps calling me an autist when I point out that their suggestions are not even related to what I was asking for (for example, one poo in the loo linked me to a tutorial on how to sort an array numerically, which isn't what I was asking for at all).
So here's what I need:
I want to take in how old a given post on my website is and what rating it has, and then output a natural number which ranks the said post. The higher the rank, the higher in...
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Hot damn CS tards are stupid.
>>7790528
I'm simply looking for a suggestion. I could easily write any function of that sort, but I'm looking for an optimal one.
>>7790513
>sorting shit yourself
This is what you do. In your database at a column called 'Rating'.
Then, make an algorithm that by using the date of the post and the likes or whatever it has produces the natural number that ranks the post.
Then, everytime someone likes a post have it run that algorithm to recalculate immediately.
Then, when someone looks up your website simply do this:
SELECT * FROM Posts ORDER BY Rating ASC
>inb4...
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Is this still a good read?
That hasn't become dated by new scientific developments?
I want to have it on my coffee table so I can come off as a pretentious atheist to my girlfriends culturally catholic parents.
It's definitely a worthy read, especially if you have an interest in evolutionary biology.
While dated and erroneous in some aspects, Darwin's insight was impressive for the time and he presented his arguments very well.
>>7790340
Yes, though a bit outdated. If you are a popscientist and have an interest in evolutionary biology I would recommend Richard Dawkins. His grasp on evolution is unparalleled and his writing is lucid and crisp. I recommend The Ancestor's Tale. Do stay away from his anti-religios books, if you are not into that sort of thing. He can be a bit zealous
>>7790340
What's the current view on evolution? I've heard that some scientist are moving away from the standard theory.
Is it true or just creationismfags in denial?
>SpaceX
>Planetary Resources
>Deep Space Industries
>Blue Origin
>D-Wave
>Tesla Motors
> buttmad neckbeard created another shit thread
you wish little man :^)
>>7793045
Well lets see...
>decline of wages and middle class = decline in sales for Amazon and Tesla
>SpaceX and Blue Origin get BTFO due to low investor confidence unless the gubmint steps in and gives them subsidies
>Tesla Motors only attract a niche market of rich normies. Also because electric batteries are still too fucking shit, Tesla stock declines, and in order to survive, gets eventually acquired by a larger companyComment too long. Click here to view the full text.
BUY OIL/TOBACCO/WEAPON STOCKS THESE WILL STILL BE AROUND IN 500 YEARS
a world of only engineers would be much like the world we see today, with skyscrapers, smartphones, 777s and porsche turbos, whereas in a world of only artists, poets, and communications majors, we would be living in caves, fingerpainting and writing poetry on the walls with our feces.
where am i going wrong, because my 140 iq mind is telling me im not
there really isnt a point in arguing with this.
Say youre right.
nature will sort out the weak ones during war and they will die or be poor for the rest of their lives. by your very definition they shouldnt be very competitive
say youre wrong
then your just a fedora neckbeard
>>7794764
there is no world of "only artists, poets and communicators" and there's no world of "only engineers". jobs are based on need. if you remove all the "superfluous" jobs you're left with the barebones basics: agriculture, farming, basic medicine. then you can add warfare technology (blacksmithing, trained warriors), more sophisticated building methods, etc etc.
art, poetry, communication as professions have tons of stability prerequisites. maybe that means they're "purer"...
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>>7794764
>World of only artists
>Everyone is an artist so the art market becomes really crowded
>Some artists can't support themselves with art
>They start exploring other skills to have means of economically surviving
>Some go into math, which leads into basic engineering
>In some years we have full blown engineering like today.
All...
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I'm currently making up for an online class that I missed most of the work for over the intersession. I have tonight to finish all my assignments....
The examples I've been given to solve are on a website called Wileyplus and the ebook I'm reading from is called Statistics:unlocking the Power of Data by Lock, Lock Lock (a bunch of locks from the same family)
Anyway... My dilemma is that I do not know what I'm doing and cannot find an answer key or pdf download anywhere on the web (haven't been able to search deep web).
With that...
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The 1st Law of Sauce outlines the fundamentals of existence and the universe. It is an abstract of the physical propensity of biotic and abiotic material. “The one that lacks the sauce is forever lost in the realms of Sauron and shall never be the same. But the one in possession of such sauce maybe overpowered by it and can potentially be misplaced to the same degree. For he who does not have balance will be damned for eternity“- Plato
>>7794641
Great
>>7794641
Bump.
Which scientist was more high test?
>>7794625
Any synthetic and or Physical chemist.
Can someone explain to me or help me understand how,
sin2(b) if tan(b) = -3/4 and cos(b) > 0 can equal to -24/25? please
Well, since you didn't give us angles we can't really help you lol..because;
Sin is a/c and cos is b/c, and finally tan is a/b but without the 3 angles of the triangle(a,b,c) it's hard to help buddy
>>7794613
This belongs in /sqt/ but I'll bite. Since the tangent is negative and cos(b)>0, sin(b)<0. let cos b = c. sin(b) = -sqrt(1-c^2), the negative value.
Solve for c in this: tan(b) = -sqrt(1-c^2)/c = -3/4
then evaluate sin (2b) using the double angle identity.
Why are highschools teaching basic trigonometry such as,
"find sin2b if tan b = -3/4 and cosb > 0"
My little brother brought this home, This shit is for like middle schoolers, do other countries really not understand trig.?
you must be so smart
I bet your an incredible wealthy inventor or
an incredibly smart researcher who has contributed invaluable resources to their field of study
>>7794597
offtopic
>study your ass off to become world class theoretical computer scientist
>this is now society rewards you
Why even bother?
>Why even bother?
Nothing is ever guaranteed in life.
When you "study your ass off," you're assuming that things will go exactly your way once you make it.
>>7794534
lel he could have just been a computer scientist and refrained from blogging into a guaranteed shitstorm.
How do we know that dark matter isn't just a bunch of dyson spheres?
>>7794516
How do we know anything bro?
How do we know that dark matter isn't matter hidden away in additional spacial dimensions that we can't access or interact with?
>>7794536
Am I even??
I'm too stupid and I can't solve this:
How in hell do I prove this function's parity algebraically? f(x)=|x+3|+|x-3|.
>>7794485
wasaffevebodywecomebaktumalabotorywhesafetyisanombeoneparyority
They say there are only 2 triangles that give you exact trigonometric ratios ( 1 1 sqrt 2; 1 sqrt 3 2), but wouldn't the trig ratios from say, a 3 4 5 triangle also be exact? I suppose the angle wouldn't be exact though, so when they talk about exact trig ratios do they mean the angle must also be a rational number? If so, why is that never mentioned? The trig ratio ratio would still be a rational number by any definition I have come across.
Any help is appreciated.
>>7794378
idk I think the angles there are just hard to work with and you can derive just about all the other angles with the 45-45-90 and 30-60-90 anyways? again idk
But in all textbooks it says that these are the *only* exact trigonometric ratios.
>>7794393
I think you're right: http://www.intmath.com/blog/mathematics/how-do-you-find-exact-values-for-the-sine-of-all-angles-6212
If you are right then there are a lot of misleading textbooks and websites out there...
I need some help finding a few problems for an assignment I have due. I don't need the answer, just the questions.
It's from the 10th edition of introductory statistics by Weiss. I need the questions 11.21, 11.23, 11.25, 11.33, 11.35 from section 11.1.
I couldn't find a .pdf of the 10th edition anywhere online and I won't receive this in the mail until Wednesday.
Any help would be appreciated.