You have a blue die with 6 sides and a red die with 4 sides.
Suppose you randomly roll a die and roll a 2. What is the probability that you chose the blue die?
do your own homework kekold
>>7719863
underage b& please leave
50%
I think the number "TEN" should have its OWN numeral as I always wondered, since we're so used to counting in COMPLETE UNITS of TEN, why are there 2 numerals that represent the last number in each unit? Why have we started counting with a 1 in front of the TEN space? I think it should be like this.
1,2,3,4,5,6,7,8,9,X
and now that we are moving on from TEN it's...
11 12 13 14 15 16 17 18 19 1X
Ah, you thought 2x? well again, because we have 10 SPECIFIC numerals instead of only 9 and confusingly using 2 numerals to represent TEN, we don't say "20" we say 1X. so 1X is the same value still, but instead of an extra 1 added to the first number, we complete the numbers 11-20 with a 1X.
The reason I like it this way is it gets rid of the zero. It's so redundant. 0 itself has no value! It doesn't actually exist! It's nothing! So when we use zero we really just mean TEN in every case, even with 20, it's ONE PLUS TEN. So 1X ! Getting rid of the zero makes this much easier as you have a complete set of 10 individual numbers instead of only 9 and THEN repeating numbers before we even completed a unit of TEN!
Ok so let's do math
75
+75
----------
14X
so instead of carrying a one, which is a bit confusing to do I don't know why we do that stuff, it sucks, but we now can just drop down the value for this specific problem. So 150 is now written as "14X". As you can see, all we did is drop down the normal values. 5+5=X and then 7+7=14. As 14X means FOURTEEN and aTEN (not fourteen PLUS ten, fourteen AND ten) we can write it as 14X instead of 150
This speeds up the process of doing math and is much less time consuming (in my opinion)
Go ahead, try it.
1354
+4931
----------
What's your answer?
>>7719310
lmao
so 11 = 10 now?
11 is 11. We don't use a 0.
what are /sci/'s thoughts on this guy?
i think khan academy is a pretty cool guy. eh teaches math to children and doesn't afraid of anything.
good vids better than cc professor
Sites like khan academy and MOOCs like EDX make me still somewhat believe in the future.
What's your favorite episode(s)?
I'd have to go with all the duct tape ones
>>7723960
One of the dumbest shows I've ever seen.
>>7723962
What's so wrong about it?
>>7723966
Non-rigorous and poorly controlled experiments. Their conclusions are presented with a moronic level of certainty when different parameters very easily could have yielded success. Their interpretation of legends and myths is also frequently left wanting.
The ice cannon comes to mind. Why would it have been a cylinder? Why would your nearly random choice of diameter and cannon ball size have been the only case? What was the salinity and mineral content of this frozen water, and what was the ambient temperature? How much powder was likely used? None of this was controlled for or even mentioned. They just did the "experiment", the goddamn thing WORKED, but it fell apart at later stages. Since it's TV they can't say "Well I'm kind of uncertain and further trials are needed... if we tweak these parameters then maybe x y z..." no, instead it's conclusively BBBBUUUUSSSSTTTTEEEEEDDDDD DUDDEE!!
You didn't bust shit. Every episode is largely the same because it's meant for entertainment. But people take it seriously. Fucking mythwhores.
Has population growth of this nature ever been witnessed in another species? What ended up happening?
This is what happens
>>7723897
Strange, but that won't happen for humans. Crashes only happen when the carrying capacity of the environment sharply drops.
>>7723897
I guess I should explain. Environments have a certain amount of carrying capacity which is determined by the features of that environment. How much food is available, how much water is available, the shelter it provides, etc. Any of those features can be considered limiting factors. If there is an abundance of shelter, that's not going to help a species if there is no food or water, for instance.
After a species exceeds the carrying capacity of it's environment, it will not completely drop off right away, but shortages will start to occur and massive die offs will ensue due to lack of resources. As a population exceeds the carrying capacity of it's environment, it can also damage that environment and lower it's carrying capacity. This is something we see in deer due to the lack of predators. The deer strip all the vegetation away, starve themselves to death, and invariably lower the amount of deer the land can sustain come spring. Damage to the carrying capacity of an environment can take years to recover. The picture shows the difference between a health understory and an overbrowsed understory. It's a little hard to see but there is a distinct line in the right image where deer can no longer reach up and nibble on the plants.
For humans, its somewhat different. We are a global species that is continuously raising, through science and technology, the carrying capacity of Earth, at least for humans. Once we exceed that carrying capacity, and can no longer increase it, that's when shit is going down. Just like the deer example above, we could completely ruin the planet for us (and everything else) and our population will drop like a rock due to famine, disease, and war over resources.
Can you guys help me out on my math problem? My friend says its six but I think it's one. Please help?
go back to /b/
>>7723815
both are correct.
For the record, it's 9 and only 9. Trying to explain that to /b/ is like pulling teeth though.
Hi /sci/
What is the evolutionary reason for moles and
are there any scientifically proven ways to remove them that do not involve going to a doctor or cutting?
>>7722898
Freeze them with liquid nitrogen.
Put duct tape on the mole for between V and VII days.
>>7722898
Do you have a mole Fetish Op? I will send you mole nudes if you ask.
http://naturalsociety.com/superbug-resistant-to-all-antibiotics-found-in-china/
>>7722638
Yes, we are all going to die some day.
>>7722704
Prove it.
Prove that we won't cure aging soon.
>>7722638
All these chemicals and drugs
Used and abused
Now you pay the price
How the fuck is this shit even possible /g/? VSEPR theory and hybridization all seem like bullshit to me. Pic related.
Single bonds sp3
Dubs sp2
Trips sp
Easy peasy
electrons all have minus charges, so they hate each other and try to get as far away as possible from one another
We gotta account for this in our diagrams.
What's the matter, Chemistry 101 got your panties in a bunch?
>>7722554
yes.
Is PCR fun?
Today I got an offer for an undergrad research position (or the equivalent thereof in my country). It's a project with the goal of finding good primers for a certain type of HPV. I would be doing some desk work and lots of PCR for about eight weeks during the next summer.
Should I do it?
The alternative is looking for another reasearch project but most of them are just deskwork. It's also probably the only time in my life I would be working in a lab, so it'd be a new experience.
>>7722305
It's an interesting concept. but doing the reaction is not fun. you're going to be doing the exact same thing many many times.
>>7722305
That being said if you're in your undergrad, doing lab monkey work is really good for your career.
>>7722308
Exactly. As an undergrad, though, it might be fun at first, but it'll quickly become dull.
But I prefer doing it over desk work, for sure.
Tau or pi /sci/?
>>7721012
Pi 4 life
pi because it's more recognizable
>>7721012
Tau because it was invented by Terry Tao.
>TFW B- in Genchem 122.
Well time to kill myself.
General /sci/ feels thread.
>>7720924
>B+ in Molecular Dynamics Simulations
>would have been an A if I turned in the last homework
>>7721028
>not doing you homework
Hello Jaquan.
How the fuck is this /sci/ feels, /sci/ is not a board about undergraduate college grades
How many degrees are in a sphere?
420, 9/11 or 360 noscope
>>7720842
https://en.wikipedia.org/wiki/Steradian
Not sure if b8
>>7720842
Approximately 41,253 square degrees, or 4pi steradians.
Calling all Calc experts
So, I started taking Calc1 in August and my final is this week. Never even heard of a derivative until Aug. I did well up until October, and then my grade started to plummet. After struggling for awhile I began to wonder if what we were doing was actually Calc1 material.
It started off as basic derivatives and integrals and whatnot. But sometime around Oct we started doing differential equations, integration by parts, cross sectional volume and volume by rotation, improper integration etc. Recently, right before exams we did infinite series stuff and discrete math.
Simply put, I want to know from some of you who have taken Calc if this is a normal pace for a Calc1 class. Keep in mind, its only been one semester, so most times we would only spend a day or two maximum on any subject. For example, we only spent one day on IBP before moving on to Euler's method.
Tl;dr Is integration by parts, volume by rotation, infinite series etc. normally part of Calc1, or is it usually covered in Calc 2,3,4?
>>7720583
Seems like Calc 2 to me. Your teacher may be trying to prepare you for the next level, but it still seems off.
integration by parts, volume by rotation, infinite series etc
is usually calc 2+ stuff. My Calc 1 class stopped at basic integrals
>>7720583
Shit man that's quite advanced for calc I. No sure about other places but in my uni we had:
-infinite sequences and serieses
-functions
-continuous functions
-derivatives
A shit ton of material on each subject, of course. Integrals were calc II, calc III was the fancy n-dimensional version of calc I. Diff eqs were a different course altogether.
Good luck m8
Girl in my class is bad at math and building circuit boards.
>Hey anon, can you please help me with this (extremely basic) vector addition?
>Sure.
>Thanks anon.
>mfw when i realize she still has a boyfriend.
Do any of you do this?
>>7719988
Helping girls with the expectation of sex is the abosolute worst of version of nice guy cu.ckery.
>>7719988
No. I got tired of women manipulating me years ago.
Rofl sucks 2 be u. The girls I talk to in ece are in the 4.0 gpa crew and usually they're the ones helping my dumbass