/sci/ - Science & Math

so /sci/ need some help here please.
(all aqueous) color observations of:
-bromine into sodium iodide
-iodine into sodium chloride
-iodine into sodium bromide

Will practice make my heart pump blood better?

I haven't been to the doctor but I honestly think that my brain is getting too little oxygen.

Also what food would be healthy in this situation? I eat a lot of sweets and sugar.

Sorry if it's off-topic

/sci/, I come to you, hat in hand.

I have been struggling for quite some time on an inductive proof of a context-free grammar.

What's sad is that I found the solution online, but I cannot figure out how they come up with their original assumption.

I am hoping some one here can help me make sense of the original assumption, because then the rest of the proof flows.

Link to problem--
http://cm.bell-labs.com/who/ravi/teddy/solutions/XX0221.html

How does he just assert "Welp, C is 3n, A is 3n+1, and B is 3n+2"? I do not see how this is proven.

LOL GUISE IM DERPING
WHEN YOU HAVE A NUMBER (VALUE OF A TERM, NOT An) IN A ARITHMETIC SERIES
HOW DO YOU FIND WHICH TERM THAT IS

hi /sci/
I have to program two methods of numerically estimating solutions to ordinary differential equations: Euler and Runge-Kutta.
Then I have to test my methods on "the differential equation given by rotation around (0,0)". The problem is, I have no clue what "the differential equation given by rotation around (0,0)". I have the two methods working, I tested them on e^x but I can't submit that. Any thoughts?
(the description is exactly as quoted and no other information about is provided)

I'm having trouble solving this equation and I can't find any info online or in my textbook about it. The first "z" and the "-4 + 7i" have a bar over it.
"z"+3z = −4−i+"−4+7i"

This is the first time ever browing this board fully but I do have a question since people on this board love math. I am needing a excel equation that I can enter to bring up a probability of a event occuring in the future. and the time frame would be in a weeks time or so. I've been looking for hours and thinking of what to do but im stumped.

Im gonna be a freshman to at the University of Florida

But I was wondering. I love nuclear engineering and would love to make it my major (it technically is right now)

Yet whats the future in it? Ive been readign quite a lot of controversy over it.

/sci/s opinions?
Just don't want to go into a field and have it die on me within 10 years.


also... would it be smart to take mandarin with my NE degree? or just to hard/tedious?

Thanks /sci/

electrical engineering is a dying breed, get out while you can

Hey /sci/, I need your useless data! Fill out this 4-question survey and I will love you for the rest of the day!

http://www.surveymonkey.com/s/2NSZZFY

How do you binomially expand this?:

(6 - 5x) / (8x^2 + 32)

is there something similar to khanacademy thats not for fucking highschoolers? mit ocw eats shit cause they still teach rudimentary shit like khanacademy and professors can't speak english cause their to busy eating shit with their moonspeak.

>>3172293

Oh god

so much LOSE

Hello sci!
I have been wondering for quite some time now:
Supposing the universe isn't euclidian,
wouldn't an observer IN said universe see it as euclidian since he is as deformed as the universe is?

(a + x)^n = a^n(1 + x/a)^n

Just wondering how you go from the left side of the equation to the right. It's easy enough to memorise but I'd like to know.

I'm doing binomial expansion btw :)

>>3087967
srsly i need help. i go to some mormon ass school on a days because of ap classes. couldn't get them all in at the school i regularly attend. i have 5 minutes to present it. not sure which order i should present things. not sure how to present the topic that atheism isn't a religion but the absence of it. i plan on introducing bertrands russels teapot idea. why religion is bad(have loads on christianity and muslims from dawkins god delusion), the "proofs" for gods existence just because they make me lol. any other important things you think i can put into 5 minute presentation, no longer. and order i should present i think that may be the most important to get these mormon asses to listen. and hopefully take out buddhism since i'm asian don't want to have them think that i'm promoting it or anything. ty.

Find an interval x=0 over which sin(x) can be approximated by:
<span class="math">\displaystyle x-\frac{x^3}{3!}+\frac{x^5}{5!}-\frac{x^7}{7!}[/spoiler]
to five decimal place accuracy throughout the interval.

I have no idea where to even start. I'm solid with finding the radius and interval of convergence on an infinite series, but I don't really know how to go about it with this partial Maclaurin series.

Can some one please help push me in the right direction?

Guys, im a bit desperate here, im a biology undergrad and i was supposed to have written a simple paper for this ethology class about some basic animal behaviour (with field work or just bibliographic research), preferably applying transition matrices. The problem is that i totally forgot about it and the fact that it was mandatory
td;dr im fucked, need help

anyone has a simple work or paper on animal behaviour? thank you

/sci/, this might be a dumb question, but my brain is full of fuck atm and I can't remember: how do you compute credit card interest?

Let's say I want to purchase an item for $1500, and plan to pay for it in 12 equal installments. How do I calculate the interest paid?

fuuuuck. Halp halp

The idea of being broken down in particles in rebuilt at another point in space or time.

How can I explain this idea to people? I've read countless threads about it on here. About whether you'd be 'you' on the other side etc.

The people I'm talking to are calling me insane for thinking about it and ridiculing the idea. I'm not saying it's possible to do now or maybe ever, really.

The main thing they keep saying is:
>But how can you break someone down and rebuild them? (like I fucking know...)
>This is loony bullshit
>[insert question that demonstrates an inability to think outside the box]

I was trying to get onto the point of "Well if we consider this, and that you brain works like 'this' then what makes you really 'you'? Would the person on the other side be you or a duplicate who is unknowingly identical and to all those around them the same?"

A question regarding signal theory (I think), more specifically aliasing.

Say we got a sinus signal with the frequency 9 Hz, and we sample at 10 Hz.

What frequency will the sampled signal have?

>>2277248

If a|n, b|n, and a and b are relatively prime, then ab|n.

How is this true?