>>11274
Oh wow, I didn't post it did I? This was the first message:

Hyati ma tamench ch3al
twahecktek W rah f galbi
bah nchoufek Nsit ma
gotlekch beli mama rayha
techrina micro sayi fatetha
la prime w wesat khali
mamer Biz

And this is the other:
r zon d tucrwk samf
pamal dvwr mafy Dfw san
couch ni dl pask Gpal

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>>11278
In the secons message, s8 is mentioned twice, leading me to believe that the letters are scrambled and directly replaced with other letter, but the words are not, the second one beginning

>r zon d tucrwk samf

r and d must be either the words A or I.
Since the word directly following "A" must be a noun,
"A cat I" doesn't make any sense.
Therefore, it must be "I (3 letter verb) a..."

Since it includes numbers but not symbols, it's not unicode (which wouldn't work great for a cellphone anyhow)
And since W and F are used in the first message and R and D in the second, they're probably 2 different versions of the same code.

Unfortunately, the word "tt" leads me to believe this is no simple code, as the only english words it could correspond to are
aa - lava
ee - eye
oo - omega/object oriented

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>>11280
You are also not taking into account that it may not be in English and that texting shorthand could have been used.

>>11290
yeah, people call me speaking spanish asking for Roberto
my name is not Roberto

>>11290
I did consider other languages. It's just that english is the most common language for double letters.

Kyle is blue, clue is a colour, kyle is a colour.

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>for every x and some y, x is a person and x knows y's business"?

For every x there exists y such that x is a person and y knows x's bsns

more intuitive would be switching y knows x's business with y is x''s parent. Then saying everyone has a parent would be exactly
∀x ∃y P(x) ⇒ K(x, y)
I think u could equivalently say
∀x such that P(x) ∃y such that K(x, y)

oh, and

>some y

is correct, but we'd rather say 'there exists y' because essentially we would want to use this y for something later, and its existence (which is often not entirely obvious) is guaranteed by this phrase, so it kind of helps to dig this intuitively.

for example a typical mathematical procedure looks like

axiom A:
people are born by other people
lemma 1.1
"for every person x there exists y such that y is x's parent"
proof
suppose x is a person that has no parents. by axiom A people are born by other people. contradiction.

lemma1.2
"if you go back in time sufficiently far and kill someones parent, he will cease to exist"

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>>10845
Kyle has an attribute that is blue, blue is a color, kyle has an attribute that is a color. Or is it colour...

the 47 is the question number from the book

Check your book for it's given definitions. All of the arguments in the definitions should be numbers in your problems, it's your job to use algebra to solve for the unknown number.

So your book will tell you that
cos(t) = h/a
where h is the length of the hypotenuse (long side), a is the length of the adjacent side (short one), and t is the angle between them.

Guessing you've already learned what you need to know, but the only thing you need to remember is SOH CAH TOA. That is; Sin = O/H, Cos = A/H, and Tan = O/A, whereas O is the opposite side of the triangle to the given angle, A is the closest side that's not the hypotenus, and H is the hypotenus.

Like Priscilla said; cos(t) = h/a, you can invert the formula to find the angle; cos^-1(h/a) = t, ex. tan^-1(20/20) = 45 degrees, which makes sense since both the opposite and adjacent are the same length, so you get a right-angle triangle.

To find individual sides of the triangle, you can multiply the function by the denominator on the other side, ex. If I want to find the opposite of the aforementioned right angle triangle, knowing only the angle and adjacent, I go from...
tan(45) = o/a
tan(45)a = o

Assuming t is in hours, gallons used equals mph/mpg.

(v)/(25+ 0.1v)

Or: (50(t / t+1))/(25+ (t / ((10) (t+1)))

(500t)/(251t+250)

Find the area under the curve from 2 to 3.

Are you sure the answer is 1.25 gallons? You'd be using more than that even if you drove at a constant t=2 speed. And you use more gas per hour as your speed increases.

c(t) = (25+ .1v(t)) = miles per gallon
g(t) = 1/c(t) = gallons per mile
v(t) = 50 * (t / (t+1)) = miles per hour
(gallons per mile * miles per hour)(t) = (gallons per hour)(t)
integral ((gallons per hour)(t) dt) = gallons(t)
integrate(v(t)*g(t)*dt, 2, 3) = ~1.25

>>10013
I'm not used to math problems being more about units O. o
that seems so simple now
ty :D

>>10016
I just rolled the dice on random thread and appeared here. I am sorry OP I cannot answer your question as I do not take or have ever taken calc. I am going to guess and say because that is what Berry said?...

>>11224
my brain

>>11242
Indeed the brain is a powerful tool

I was the kid who brought absolutely nothing to class, and obviously do not have a calculator. Ended up using my pure braib skills. Nowadays my ex schoolmates often get stuned by how a lazy person like me could handle crazy calculations.

So stop using your stupid calculators and figure out ways to live without them.

I have a ti-84 plus and it's doing good so far.

I program fractals, cellular automata, labyrinth, trees and stuff with it, it's fun.
And I do the same thing on computer too, and it's fun too. I use my calculator to rapidly draw functions and check formula, or when I'm bored and I don't have a computer.

I got a ti-89 like 5 or 6 years ago when I was in hs, does everything I need, I like the way it displays input helps find any mistakes I might have made

I have a ti-89 emulator for my smart phone for anything that needs to be done on the go which is complicated... because I'm out of school that basically never happens.

Tbh, if it's not something super complicated that I need matlab/r/eviews for, I just use wolfram alpha these days. I'm pretty much always near a computer anyhow (and they have a mobile app).

tl;dr there's not really a good reason to use a calculator these days other than maybe the fact that some of them are solar powered.

four, dumbass.

2+2 = 5 for large values of 2

>>11253

Lol

we need angles, your drawing lack a lot of data

>>11166
I like a challenge though. I've had no physics above introductory classical mechanics (which did not include gravitational fields) and electricity and magnetism so if I make some mistakes please point them out I'd like try to learn how to solve a problem like this. After some googling and wolframing here's my attempt at the first part of the solution.

The north/south component of Bob's velocity would be 0.95*c*cos(10)=0.9356*c to the south.
Since relative velocity is approaching speed of light, Lorentz transformation is necessary. V relative = (v1+v2)/(v1*v2/c^2+1)= 99.26% the speed of light.
Plugging this into relative length contraction formula
L = Lo*sqrt(1-v^2/c)= 0.086 X.
So it looks like the car won't be very long from his reference point.

For the time
T = To / sqrt(1-v^2/c) = 11.627* T

>>11217
shouldn't the gamma factor be (1-v^2/c^2)?

>>11218
Oh, yeah, I think you're right.
So gamma would be = 0.1214
making L = 0.1214*X
and T = 8.2352*T

>>11218
nah dude, the lorentz factor is
(1/sqrt(1-v^2/c^2)), although I do believe you have a problem with your relative velocities. The y-components must be added together with the lorentz transform, but then you have to remember to add back in the x-component of bob's motion, because alices car shrinks along its axis of motion according to the lorentz factor for her TOTAL relative velocity, not just the y-components

>>11207
You really have to watch the movie. They're trapped in a giant rubiks cube-esque device with 17 million some rooms and they die if they go in the wrong ones and they have to figure out mathematically if the coordinates of the room are dangerous blah blah blah it's kinda cool.

>>11235
not gonna lie, those cube movies were some of the worst movies i've ever seen in my life.

>>11237

>/home/derek/Pictures/Hypercubic_Crucifixion.jpg

Blasphemer!

>>11238
Huh, meant to copy and highlight text in the post I linked to. Ended up revealing my name and the directory to the file I posted instead. Whoops.

Happy Easter!

>>11237
But they're Canadian, so that's like a normal movie in the US.

>>11192
The first part is pretty much the definition of the second derivative. That is to say, the second derivative of with respect to t is the derivative with respect to t of the derivative of r with respect to t, (d^2r/dt^2) = (d(dr/dt)/dt) = d/dt(dr/dt).

From (23) we have that dr/dt = u(r(t)), they just use the shorthand u(r(t)) = u(r). So,
d/dt(dr/dt) = d/dt(u(r)).

The next part is just the chain rule from calculus. du/dt = (du/dr)*(dr/dt). Since multiplication is commutative this can be rewritten as (dr/dt)*(du/dr).

Using (23) again, du/dr = u(r) which they again use shorthand to write as simply u.

Thus we have (dr/dt)*(du/dr) = u*(du/dr). The last part is a little tricky, but you can think of it as just another application of the chain rule. So we have d(u^2)/dr = 2*u*(du/dr), thus multiplying by 1/2 on both sides, 1/2(d(u^2)/dr) = u*(d(u(r))/dr).

If you evaluate that last term on 24 (i.e., take the derivative of u squared with respect to r), it comes up with the second-to-last term. I don't remember ever seeing that done in reverse, but it does work.

>>10162

Stat as a field is pretty massive. What I think you should do is google some mathematical statistics books such as An introduction to probability theory and mathematical statistics by Rohatgi, and work through it.

To truly understand statistics (not just memorizing formulas and methods) you need some real analysis (maybe a touch of topology some times) and get serious about it. The text i mentioned is going to be a graduate level text, but that will set you in the right direction to getting good stat understanding

Thank you all for your help.

By the way, is this a good glossary of statistics, or are many things missing:
http://en.wikipedia.org/wiki/Outline_of_statistics

>>10210
Sadly i'm not getting my PhD in statistics so my opinion isn't that informed. But I think this is a good overview.

The complicated work in statistics is the methods used to improve your estimators (such as variance or a more accurate mean). Something to keep in mind

That's most basic undegrad statistics. As a math student had that all covered in first year (of statistics, but we had stats introduced at our second year. I figure stat student have that in their first year, wouldn't be surprised if it was just the first semester actually)

Stuff gets more complicated after that :P Also, it diverges from advanced probability (I remember at the beginning probability and stats are about the same thing, maybe just from slightly different angles) For instance likelihood analysis, multivariate statistics, autocorrelation... Not sure if they use measure theory in stats but thats when things start to get wicked. Pretty much your mind map covers the fundamentals on which uni level stats builds

Well shit, I could've saved a lot of money not buying that :/

6ω² is as far as I get