Anyone bere knows sites to leaen biology-chemistry math-calculus

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Anonymous
2016-01-12 10:39:47 Post No. 7778295
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Anonymous 2016-01-12 10:39:47 Post No. 7778295 [Report]

Anyone bere knows sites to leaen biology-chemistry math-calculus end exercise?
This is my last year of school, and i am having lots of troubles because i found some gaps in my instruction, due to the fact that i didn't get anything to study from.I've always been very good in scientific subjects but this year i'm shitting bricks, sorry for any grammar mistakes, but i'm terrified(and foreign).
Please, i need help.

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Anonymous 2016-01-12 10:49:43 Post No.7778301
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Anonymous 2016-01-12 10:49:43 Post No.7778301 [Report]

Guys those grammar mistakes are phone mistakes, sorry again.

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Anonymous 2016-01-12 10:51:20 Post No.7778304
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Anonymous 2016-01-12 10:51:20 Post No.7778304 [Report]

It's not help with homeworks, i need a solid reference to improve my math skills

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Anonymous 2016-01-12 10:58:53 Post No.7778309
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Anonymous 2016-01-12 10:58:53 Post No.7778309 [Report]

>>7778295
wut?

https://www.khanacademy.org/
has a bunch of intro level material

if you are looking specifically for problems to work on, just go to bookzz.org and download textbooks for free

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Anonymous 2016-01-12 11:56:26 Post No.7778403
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Anonymous 2016-01-12 11:56:26 Post No.7778403 [Report]

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22 KB, 769x924

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Anonymous 2016-01-12 13:48:47 Post No.7778578
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Anonymous 2016-01-12 13:48:47 Post No.7778578 [Report]

>>7778295
If you're wondering about that limit in the picture use L'Hopital's rule.

lim x->0 sin(x^2)/x = lim x->0 2x*cos(x^2)/1 = 0