Thread #16944314
/sqt/ - simple questions thread (aka /qtddtot/) Anonymous 04/03/26(Fri)03:59:20 No.16944314 [Reply]▶
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/sqt/ - simple questions thread (aka /qtddtot/)
Previous thread: >>16893204
>what is /sqt/ for?
Basic questions regarding maths and science. Also homework.
>where do I go for advice?
>>>/sci/scg or >>>/adv/
>where do I go for other questions and requests?
>>>/wsr/ >>>/g/sqt >>>/diy/sqt etc.
>how do I post math symbols (Latex)?
rentry.org/sci-latex-v1
>a plain google search didn't return anything, is there anything else I should try before asking the question here?
scholar.google.com
>where can I search for proofs?
proofwiki.org
>where can I look up if the question has already been asked here?
warosu.org/sci
eientei.xyz/sci
>how do I optimize an image losslessly?
trimage.org
pnggauntlet.com
>how do I find the source of an image?
images.google.com
tineye.com
saucenao.com
iqdb.org
>where can I get:
>books?
libgen.rs
annas-archive.org
stitz-zeager.com
openstax.org
activecalculus.org
>articles?
sci-hub.st
>book recs?
4chan-science.fandom.com/wiki//sci/_Wiki
math.ucr.edu/home/baez/physics/Administrivia/booklist.html
>online courses and lectures?
khanacademy.org
>charts?
imgur.com/a/pHfMGwE
imgur.com/a/ZZDVNk1
>tables, properties and material selection?
www.engineeringtoolbox.com
www.matweb.com
www.chemspider.com
Tips for asking questions here:
>avoid replying to yourself
>ask anonymously
>recheck the Latex before posting
>ignore shitpost replies
>avoid getting into arguments
>do not tell us where is it you came from
>do not mention how [other place] didn't answer your question so you're reposting it here
>if you need to ask for clarification fifteen times in a row, try to make the sequence easy to read through
>I'm not reading your handwriting
>I'm not flipping that sideways picture
>I'm not google translating your spanish
>don't ask to ask
>don't ask for a hint if you want a solution
>xyproblem.info
26 RepliesView Thread
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>>16946435
Don't worry, it'll be up and going right after spring break.
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>>16947913
If you can construct the diagram like this, that could work out alright in Geogebra
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>>16947913
>it's a geogebra question
https://www.geogebra.org/
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>>16957721
Basically the same as >>16957863, but just check if (a+b-c)(a-b+c)(-a+b+c) > 0, cause triangle equality says all 3 terms are positive and it isn't possible for 2 to be negative. No need to consider area
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>>16944314
I want to make a borax mixture, as explained here: https://alsnetbiz.com/homeimprovement/homemade.html (the "equivalent to Bora-Care". instructions under "Prepare the concentrate")
I plan on using propylene glycol, and heating the mix in an electric kettle made of glass and/or a ceramic pot.
is this propylene glycol as safe as the instructions say? is the borates mix safe enough to reuse the pot, or should I only keep it for chemical stuff in the future?
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>>16958904
yeah, that's why I chose to use it instead of the ethylene.
still, I want to be as cautious as possible. that's why I'm asking.
what about the borax and boric acid? also wonder about the gases. at 260°F I can imagine some nasty things might form and fly from the mix?
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>>16958170
>(a+b-c)(a-b+c)(-a+b+c)
= (a + b – c)*(a + c – b)*(b + c – a)
= (a + b + c – 2*c)*(a + b + c – 2*b)*(a + b + c – 2*a)
= (2*s – 2*c)*(2*s – 2*b)*(2*s – 2*a)
= 2*(s – c)*2*(s – b)*2*(s – a)
= 2^3*(s – a)*(s – b)*(s – c)
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>>16958170
>(a+b-c)(a-b+c)(-a+b+c)
= (a + b – c)*(a + c – b)*(b + c – a)
= (a + b + c – 2*c)*(a + b + c – 2*b)*(a + b + c – 2*a)
= (2*s – 2*c)*(2*s – 2*b)*(2*s – 2*a)
= 2*(s – c)*2*(s – b)*2*(s – a)
= 2^3*(s – a)*(s – b)*(s – c)
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>>16958918
>wonder about the gases
No harmful gases should come off, borates will not decompose from the heat and they wont react with anything in your mixture.
Dont reuse the pot for making food borates are toxic to eat keep that pot for chemistry/junk