Dum dum containment

[Anonymous No.10311650]

Studying again!

I found an algebra book, on page 13 now!

Will be asking

[Anonymous No.10311654]

>>10311650
The quotient of three times the difference of ten and two divided by their sum

Is 48? I think I’m too stupid for this question but I tried anyway

Inevitable people accusing me of bait or being a child (I’m 25)

[Anonymous No.10311661]

A 2.2 kg block of ice initially at a temperature of -20C is immersed in a very large amount of liquid nitrogen (LN) at a temperature of -196C, and the nitrogen and H2O are allowed to come to thermal
equilibrium. [TBP(2) = -196C] Create a particular model of this process and use it to determine how much LN is converted to gas (vapor). [The emphasis on “very large” implies that there will still be LN left when the two come to thermal equilibrium.] The answer is supposed to be 4, but I have no idea how to get there. Help pls

[Anonymous No.10311686]

>>10311650
>algebra
You got me excited OP, I thought we were gonna solve problems from Lang together!

[Anonymous No.10311732]

Guys I’ve been stuck in 31 for literally an hour

I know the answer is one coz it’s ok the back of the book but... i don’t understand the steps

>>10311686
Who

[Anonymous No.10311736]

>>10311732
convert them all to improper fraction, then simplify

[Anonymous No.10311745]

>>10311736
Omgggg
I did it
thankssss so much

[Anonymous No.10311752]

>>10311736
I’ love yoooou

[Anonymous No.10311759]

any one able to help me out with 3rd degree polynomials? I need to solve for x but have no idea how to do it, iv gone through quadratics and can find x with those..
x3 –19x+30=0

[Anonymous No.10311771]

>>10311654
3(10-2)/10+2
3(8)/12
24/12
2

[Anonymous No.10311794]

>>10311771
Can you explain in words

[Anonymous No.10311806]

>>10311794

>The quotient of three times the difference of ten and two divided by their sum

The first term of the division is the difference of 10 and 2, 10-2, but the result of this subtraction must be multiplied by 3.
So we can write 3×(10-2).
The other term of the division is the sum of 10 and 2 so 10+2.
Now you have to find the quotient of those two terms (3×(10-2) and 10+2).
So 3×(10-2)/(10+2).
To write in other words the question: Multiply ten minus two 3 times and then divide it by the sum of ten and two.
Got it?

[Anonymous No.10311832]

How is the answer to question 5 a nine not an eight?

[Anonymous No.10311838]

>>10311832
36-9 = 27
27/3 = 9

dude, why are you even doing these? This is literally middle school math.

[Anonymous No.10311839]

>>10311838
I don’t want to be retarded forever


Don’t be meaaan

[Anonymous No.10311841]

>>10311838
he gotta start somewhere

[Anonymous No.10311846]

>>10311839
I know, but I'm worried you're wasting your time. Do you have something you're better at? I would start pursuing that instead.

[Anonymous No.10311847]

>>10311846
>>I know, but I'm worried you're wasting your time. Do you have something you're better at? I would start pursuing that instead.
Basic mathematics is worth mastering. It's almost an imperative to know at least up to basic calculus.

[Anonymous No.10311867]

>>10311846
No

I’ve been neet for years, brain dead

I don’t plan on becoming a math master

Just enough to get by

[Anonymous No.10311877]

>>10311846
This kind of made me sad... am I really wasting my time?

[Anonymous No.10311880]

alright0 dum dum question,
cubic equations... I think they're also known as 3rd degree polynomials? y=ax^3+bx^2+cx+d

how do solve for x when y=0?

is this even crucial or should I just push on to more important shit like functions?

[Anonymous No.10311928]

>>10311880
I think x would be a negative number?

But dum dum here too don’t take my word for it

[Anonymous No.10311930]

>>10311880
you google the solution set for cubic equations. it gets complicated very fast after 2nd degree polynomials and is literally impossible after 4th degree.

[Anonymous No.10311966]

>>10311928
need 3 number anon,
>>10311930
doubt I can use the internet as a resource during an exam but yeah, its a helpful tool. ive read something about a p/q? or finding factors that sum to b?

[Anonymous No.10311969]

>>10311966
you can use a tricky substitution to eliminate a term in the polynomial that helps you find the solution but it's still quite difficult. if you can derive the quadratic equation from scratch without looking it up then go for cubic but if you can't do that (even that one is pretty god damn hard without any hints) then you won't be able to do it for cubics. and the only p/q i know of in this context is for proving/disproving rationality of numbers
https://en.wikipedia.org/wiki/Rational_root_theorem

[Anonymous No.10311978]

>>10311969
ive sorted quadratics.. I found that relatively easy once I got the concept, + the formula
x= −b± √ (b2 − 4ac) / 2a sorted out any difficulties.. was hoping there was a formula but all I see is guess and check. baka.

[Anonymous No.10311980]

>>10311978
i meant getting that equation from 0=ax^2+bx+c with no hints. i 100% couldn't do it without knowing the answer which you posted and am impressed somebody eventually did do it

[Anonymous No.10312005]

>>10311877
You have to determine that for yourself. If there is something you really want to pursue other than science/math then you probably are. If you really want to go for it though, everyone has to start somewhere and you're probably not. If you put in enough hard work you should be able to get at least enough of a grasp on scientific concepts to make money out of it.

[Anonymous No.10312418]

>>10311732
Whelp, this definitely wasn't the thread for me.

[Anonymous No.10312511]

>>10312418
One day you and me will be all in one basement with thick glasses arguing about what the lang guy do

[Anonymous No.10312801]

>>>/int/100421101 this doesn't work in the real numbers, right?

[Anonymous No.10313558]

>>10312418
lang is a meme

[Anonymous No.10313604]

>>10311877
Studying math is never a waste of time.

[Anonymous No.10313617]

Is there free site that gives me algebra problems to do? I need to get this shit down to reptile brain reflex. Especially the distributive property and and fractions

[Anonymous No.10313743]

>>10311877
>>10311877
It depends why you are learning this now and not in 6th or 7th grade. If we knew more about your situation or your IQ we could give you a better answer.

Also keep in mind that your application of math to every day life will be weaker than what you have learned in theory. Also the math that your brain does effortlessly will be even less than that.

For example when I was in college I was talking to my dorm mates (business school so everyone was too dumb to do STEM) about falling out of bunk beds.

Someone claimed that falling out of a bed twice as high you would be going more than twice as fast when you hit the ground because as time increases, distance increases by the square of the time. However, I knew in a split second that this was wrong. No one believed me when I said the opposite was true. These were all people that completed pre-calculus so they could do 11th grade math, but they failed middle school math.

Point is by the time you are through 11th grade math, it will still be an extreme struggle to apply 8th grade math to your daily life.

Also the difficulty of math is not linear, it’s closer to being exponential. Let’s say every year it becomes 20% more difficult.

Pre-Algebra is what you’re doing right now
Algebra (and geometry) is 20% harder
Algebra II (and trigonometry) is 20% harder than Algebra
Pre-calculus is 20% harder than Algebra II
Calculus is 20% harder than Pre-Calculus

^This is actually a good algebra problem. How much harder is Calculus than Pre-Algebra?

[Anonymous No.10313750]

How difficult is it to do 5 courses at once? People are telling me I should start with less courses and get acclimated to work again before I go back to school. How difficult do you think these courses would be to manage in the same semester?

Advanced C++
Fiction Writing
Greek Classics
Mathematical Modeling
Software Engineering

Also, what math courses should I take to be better at programming?

[Anonymous No.10313767]

>>10313617
I would go into a school and ask for old textbooks. They might give them to you for free.

>>10313750
Is 4 classes going to be closer to 15 credits (or whatever the full time credits is at your school)? More than 15 credits is fucking brutal, I don’t care how high your IQ is. All 5 of those classes are going to be time consuming as fuck as 3 of them are STEM and 2 are writing intensive.

[Anonymous No.10313775]

>>10311880
These are impossible unless the variables are -1, 0, or 1. You literally just have to guess.

[Anonymous No.10313800]

>>10313750
>How difficult is it to do 5 courses at once

Normal workload for non-meme majors is 5 to 6 courses + labs/seminars

[Anonymous No.10313812]

>>10313750
>Advanced C++
Easy as fuck
>Software Engineering
Easy as fuck
>Fiction Writing
Why are you taking that? and you better not say to write better fan fiction

[Anonymous No.10313824]

>>10313767
>More than 15 credits is fucking brutal,
Not really.
> I don’t care how high your IQ is.
IQ is a meme.

[Anonymous No.10313919]

>>10313800
>>10313812
>>10313824
Wow your dick is way bigger than mine. Congratulations.

[Anonymous No.10314065]

>>10313767
It's gonna be 15 credits of the total 120, thanks for answering

[Anonymous No.10314089]

>>10313558
stop larping and posting this every time lang is mention

[Anonymous No.10314096]

>>10311661
The question is asking you to calculate the amount of energy it takes to bring 2.2 kg of ice from -20 C to -196 C. To get this energy, nitrogen has to vaporize, changing its phase from liquid to vapor. Solve this energy balance equation to get your answer:

[eqn]
m_{H_2O}\int_{T_i}^{T_F} C_{P,H_2O}~\text{dt} = m_{N_2} \Delta H^{Vap}_{N_2}
[/eqn]

[Anonymous No.10314103]

>>10314096
Should be [math] \text{dT} [/math], not [math] \text{dt}[/math]. Also, keep in mind the phase of [math] H_2O[/math].

[Anonymous No.10314151]

im taking
Algebra 2
Analysis on Manifolds
ODEs
Applied Complex
Art History
Data Science
That's 19 credits
Am i fucked?

[Anonymous No.10314167]

>>10314151
It's doable, but you'll be spreading yourself thin. I'd avoid it if I could.

[Anonymous No.10314181]

>>10314151
No.

[Anonymous No.10314182]

>>10314065
Sounds tough but manageable. Good luck.

[Anonymous No.10314202]

>>10314151
On the off chance that this isn't a meme:
art history and analysis on manifolds is already gonna take most of your free time. This is not doable.

[Anonymous No.10314355]

>>10311806
I did thanks

[Anonymous No.10314358]

>>10313743
Shitty school and terrible education + parents didn’t give a shit about education

[Anonymous No.10314390]

>>10314358
Work hard brother. Don't forget the board you're on, so people are gonna think they're better than you. That's how it works, but it doesn't at all mean you're hopeless.

[Anonymous No.10314399]

>>10314151
Nigga what the fuck?????¿?¿ Algebra 2 and analysis on manifolds at the same time? What are you smoking?

[Anonymous No.10314501]

>>10314358
In what way?

[Anonymous No.10314577]

>>10314151
>Analysis on Manifolds
>ODEs
>Applied Complex

Why are you taking ODEs so late?

[Anonymous No.10316223]

>>10311650
Pretty cool to see you guys are helping:)

[Anonymous No.10316229]

>>10314089
Lang is actually a meme. Nobody uses his books for anything more than a reference text

[Anonymous No.10316283]

>mfw stupid as fuck with math
>mfw i see this thread

[Anonymous No.10316304]

dx/dy doesn’t literallly mean d times x divided by d times y, it is just a shorthand way of describing the derivative of x in relation to y.
WTF I NEED A QUICK RUNDOWN ON DERIVATIVES WTF ARE THEY???

[Anonymous No.10316532]

>>10316304
Derivatives describe the rate that things change. If you have a job account and you get paid $1,000 twice a month, then your bank balance will look like:

time passed | bank balance
0.0 months | $0
0.5 months | $1,000
1.0 months | $2,000
1.5 months | $3,000
2.0 months | $4,000

etc. You can make up an equation for your balance:
[eqn]\text{balance} = \text{month}\times (\text{\$}1,000 \times 2) [/eqn]
If you want to find out how much your balance will change every month, take the derivative:
[eqn]\frac{\text{d}(\text{balance})}{\text{d}(\text{month})} = \text{\$}1,000 \times 2 [/eqn]

[Anonymous No.10316535]

How are all numbers equally close to infinity?

[Anonymous No.10316625]

>>10314358
I know that shitty school feel.
>be me in 6th grade
>doing well in all of my classes
>math teacher recommends I skip pre-algebra and go straight to algebra because of my performance
>okay sure
>enter 7th grade
>algebra kicks my ass and I'm completely lost
>parents send me to Sylvan for tutoring, it doesn't help

I had always loved school until this happened and I never recovered. I'm terrible at math to this day.

[Anonymous No.10316637]

I'm having trouble with this one. So the problem says [math]x+1=2[/math] . But what is [math]X[/math]?

[Anonymous No.10317238]

>>10316637
X = capital 1

[Anonymous No.10317703]

>>10311867
Don't let anyone in /sci/ talk down to you. Using your brain is always good, especially if you do it purposely and willingly.

[Anonymous No.10317709]

>>10311880
You're looking for
Polynomial division or Horner's method

The former is slightly easier to understand, as it is mostly long division. The latter is much faster but requires the understanding of the former to do it properly.

[Anonymous No.10317712]

>>10313617
Just google stuff like
"Topic exercises PDF" or something similar. Usually gets you downloadable exercises en masse, especially in math.

Also helps you learn the correct subtopic names.

[Anonymous No.10317717]

>>10313812
Fiction writing is important for developing creativity, something that most pure scientists lack and this board lacks entirely.

Read up on the great physicists and mathematicians. They all read extremely muh high literature.

[Anonymous No.10317718]

>>10314355
Figured I'd comment, since I just drew a comparison. There's a notation of math/programming0 called prefix notation, it's one way of organizing the math (operations always come first. Language isn't that consistent, but we can start parsing the sentence that way, since an "operation" came first

In a "Lisp-like" language:
>The quotient of three times the difference of ten and two divided by their sum
>the quotient of
( /
>three times
(* 3
>the difference of
>( -
>10 and 2
>( - 10 2)
>divided by their sum
>(/ <the preceding stuff stuff> (sum))
>(/ (* 3 (- 10 2)) (+ 10 2))
>(/ (* 3 8) 12)
>(/ 24 12)
>2
Honestly 091-101 math is usually awful in how they teach it. I'll keep the the thread open to see if I get a (you) because I tutored professionally for years and I like to do it.

[Anonymous No.10317720]

>>10316625
I hate this. No one should skip classes, it fucks with childrens' social development, especially if done in elementary school.
Just separate the smarter kids into a special course where they get additional material for that particular subject. They might still suck at other subjects.

[Anonymous No.10317731]

>>10313743
Pre-Calc and below are shitly taught. Pre-Calc is seriously the worst math ever. Why would anyone need to be able to expand cos(8x) or other shit 10x in a row. I got to skip it in high school, never suffered for it, and I think anyone who takes it becomes worse at math, it's that bad of a course. Remedial math is about as bad as pre-calc, but I think a little less because it's just more poorly taught, versus pre-calc which is brain damaging. Calc I and beyond are piss easy in comparison.
>Japanese raised kid bitching about the "self-taught" software system we had
>it was actually awful but he's just bad at math
>we did this in fourth grade!
>then you should be better at it

[Anonymous No.10317791]

>>10313617
this is a year 11 maths B text book I used through highschool.

http://pdfs.jacplus.com.au/secure/resources/0731408101/PDF/Book/MQB_Yr11_Qld2e_TI_v3_Book.pdf

hope it helps

[Anonymous No.10317815]

>>10313617
Just kahn academy your way to pde's and take it from there.

[Anonymous No.10317845]

>>10316625
Had an algebra teacher who died and then had a different substitute every day, sometimes nobody showed up. My class was also full of degenerates. I passed but didn't learn shit, now I'm teaching myself.

[Anonymous No.10317935]

>>10311732
bracket whore

[Anonymous No.10319329]

so this is the power of

[Tuba Jam No.10319403]

>>10311880
sometimes you can group them.
Let's say you have y=6x^3+3x^2+16x+8
you can group them: (6x^3+3x^2)+(16x+8)
and factor out a common factor: 3x^2(2x+1)+8(2x+1)
and regroup: (3x^2+8)*(2x+1)
set both sides to zero and you know the rest
also if there is no constant then you can factor out the x and get a regular quadratic.

This works in such a vanishingly small number of cases that it doesn't really matter. I would recommend moving on as long as you can do the factoring.

[Anonymous No.10319862]

>>10314096
thank you

[Anonymous No.10320130]

>>10319403
thanks legend!

[Anonymous No.10320312]

>>10316532
What does the d mean tho???

Inb4 cock

[Anonymous No.10320437]

>>10320312
[math]\text{d}[/math] represents a really small change, similar to when you use [math]\Delta[/math]. Taking a derivative is like a "more accurate" version of doing this:
[eqn]\frac { \Delta ( \text {balance} ) } { \Delta ( \text {month} ) } = \frac{(\$ 2,000)-(\$ 0)}{(1~\text{month})-(0~\text{months})} = \$ 2,000/\text{month}[/eqn]

[Anonymous No.10320466]

>>10320437
Are they saying d for delta or d for derivative?

[Anonymous No.10320479]

>>10320466
d is derivative.