Math!! ^_^

Ikerous · Dec 10, 2005

So, who wants to do math?

Someone asks a math problem, then the person who answers it asks a new one.
You can keep score if you really care

I'll start out with an easy logic problem anyone can figure out

Add, subtract, multiply, and divide the numbers 3,3,5,7 (use each once) in any way to get 24.

Greatgat · Dec 10, 2005

You know, I'm really not surprised about a thread like this from you. No good at maths, I am. I'm an english major.

But hey, best of luck.

Blackghost905 · Dec 10, 2005

ok 2 (4+4) 3535-35 x squared

x = 4

ríomhaire · Dec 10, 2005

I'll see what I can do.

Kamikazie · Dec 10, 2005

damn...i can get 25 and 23 but not 24 :angry:

Ikerous · Dec 10, 2005

ríomhaire said:
I'll see what I can do.

Kamikazie said:
damn...i can get 25 and 23 but not 24 :angry:

^_^ <3

Solaris · Dec 10, 2005

3+3=26+5 -7

Done
Ill let the next person to post ask teh question

Ikerous · Dec 10, 2005

:| Am I the only one unsure how 3+3=26?

Nat Turner · Dec 10, 2005

This was on my last Calc 3 exam:

The volume of a cone of radius r and height h is (pi*r^2*h/3). The radius is increasing at a rate of 2 in./s while its height is decreasing at a rate of 3 in./s. At what rate is the volume of the cone changing when r=120 in. and h=140 in. ?

ríomhaire · Dec 10, 2005

7^2 means seven squared.

Code:

    [U]-x+4[/U]
2x=x^2-4

probably easy for you.

Kamikazie · Dec 10, 2005

Ikerous said:
:| Am I the only one unsure how 3+3=26?

its the british math...it is all screwed up... :E

j/k guys, love you bunchs <3

Nat Turner said:
The volume of a cone of radius r and height h is (pi*r^2*h/3). The radius is increasing at a rate of 2 in./s while its height is decreasing at a rate of 3 in./s. At what rate is the volume of the cone changing when r=120 in. and h=140 in. ?

2,110,080 inches?

ríomhaire · Dec 10, 2005

Ikerous said:
So, who wants to do math?

Someone asks a math problem, then the person who answers it asks a new one.
You can keep score if you really care

I'll start out with an easy logic problem anyone can figure out

Add, subtract, multiply, and divide the numbers 3,3,5,7 (use each once) in any way to get 24.

7*3=21
21+3=24
24+5*0=24

AntiAnto · Dec 10, 2005

ríomhaire said:
7*3=21
21+3=24
24+5*0=24

You can't use the zero, can you?

Raz · Dec 10, 2005

I don't you're allowed to use the 0, Riom.

Ikerous · Dec 10, 2005

No, 0 is adding an extra random number

@ Nat: Bastard! I take calc3 next semester. Too many variables

I'm still trying to figure out a way though ><

::starts trying rio's problem cuz it looks more doable::

Nat Turner · Dec 10, 2005

Kamikazie said:
2,110,080 inches?

I think it's 8,000 pi inches^3/s. Not completely sure though, I pulled it off the review sheet.

Que-Ever · Dec 10, 2005

Gaa, you smart peoples and your maths... I wish I could get math.

Nat Turner · Dec 10, 2005

A boat takes 3.00 hours to travel 25.0 km down a river, then 5.50 hours to return. How fast is the river flowing?

Ikerous · Dec 10, 2005

@ rio, does that function have any rational values of x?
I tried the rational root theorm thing so i assume they're irrational
in which case x is close to -1.459 or 2.109

::tries nat's::
Can this be done with calc1 or 2?

Nat Turner · Dec 10, 2005

Ikerous said:
::tries nat's::
Can this be done with calc1 or 2?

Yeah, it can be done easily. Doesn't even take calc, just algebra. It's simple physics.

Llama · Dec 10, 2005

Im only in year 9, havent done that yet

An easy one:

What does 2a(squared)b X 5a(squared) b(the power of -5) equal?

Ikerous · Dec 10, 2005

Nat Turner said:
Yeah, it can be done easily. Doesn't even take calc, just algebra. It's simple physics.

Yea i noticed that after i started it

I got 2.5 km/h, but i havent checked it yet

ríomhaire · Dec 10, 2005

A boat takes 3.00 hours to travel 25.0 km down a river, then 5.50 hours to return. How fast is the river flowing?

3.787878787...km/h?

@Ikerous's, I have no idea what you just said. x has 3 values.

Ikerous · Dec 10, 2005

ríomhaire said:
@Ikerous's, I have no idea what you just said. x has 3 values.

Oh, haha, -.649 too

ríomhaire · Dec 10, 2005

Ikerous said:
Oh, haha, -.649 too

Unless I made a bad mistake making the damn question the answers should be

-2, -0.5 and 2

:S

Ikerous · Dec 10, 2005

ríomhaire said:
-2, -0.5 and 2

:S

......-x+4
2x=x^2-4

if x = 2, then 4 = 2 / 0...

And if anyone was curious about the first problem
3*(3*5-7)=24

ríomhaire · Dec 10, 2005

Ikerous said:
......-x+4
2x=x^2-4

if x = 2, then 4 = 2 / 0...

I think you may have misinterpreted it. It is supposed to mean:
two x is equal to minus x plus 4 all over x squared minus four

Ikerous · Dec 10, 2005

ríomhaire said:
I think you may have misinterpreted it. It is supposed to mean:
two x is equal to minus x plus 4 all over x squared minus four

And if x is 2, then...
two times two is equal to negative 2 plus 4 all over 2 squared minus four
so 4 = 2 / 0...

Anyone know ∫sqrt(9 - x^2) dx from 0 to 3?

Ooh, or more 24 questions!
make 24 with 1,3,4,6

The Monkey · Dec 10, 2005

Has the first question been solved yet?

Ikerous · Dec 10, 2005

The_Monkey said:
Has the first question been solved yet?

No

Which is why i posted the answer about three posts up

ríomhaire · Dec 10, 2005

IDIOT! */me realises mistake*
Should be:

Code:

   [U]-x^2+4[/U]
2x=x^2-4

A boat takes 3.00 hours to travel 25.0 km down a river, then 5.50 hours to return. How fast is the river flowing?

1 and 59 over sixty six?

Ikerous · Dec 10, 2005

In that case i get x = -1/2

2 still doesnt work, cuz then 4 = 0/0

bvasgm · Dec 10, 2005

OMG!! 3 really doesn't = white shoes :O

http://en.wikipedia.org/wiki/Talk:Proof_that_0.999..._equals_1

There is no proof that demonstrates 0.999... = 1 but there is solid proof that demonstrates 0.999... < 1. See the proof by induction if the sysops have not censored it yet. The number 0.999... is not a limit, it is an infinite sum. Even if you were to treat it as a limit, the limit is not equal to the infinite sum. Just try adding the following: 9/10 + 9/100 + 9/1000 + .... add as many terms as you like. You will notice that the terms keep getting closer to zero and the sum keeps getting closer to 1. However, no term ever becomes zero and no sum ever becomes 1.

Dan · Dec 10, 2005

what is the solution to 2x'' +8x' +80x = sin(t) where x(0) = 0 and x'(0) = 0 and how does it behave as t nears infinity

AntiAnto · Dec 10, 2005

Nat Turner said:
A boat takes 3.00 hours to travel 25.0 km down a river, then 5.50 hours to return. How fast is the river flowing?

I'm really not sure, but I've calculated 1.88 Km/h for the river. And 6.42 Km/ for the boat.

Bait · Dec 10, 2005

Edit : Oh Noes!11 Idiocy!

make 24 with 1,3,4,6:

(6-1)^2 -4 +3=24

Am I allowed to square?

AntiAnto · Dec 10, 2005

Bait said:
make 24 with 1,3,4,6:

(6+3-1) x 4 = 24

8*4 doesn't make 24. Hurry up, edit!

ríomhaire · Dec 10, 2005

Ikerous said:
In that case i get x = -1/2

2 still doesnt work, cuz then 4 = 0/0

I just realised that the numbers above and below are equal but opposite, man I suck.

What I did to make sum:
got 2x^3+x^2-8x-4=0 from a book (answers 2, -2, -0.5)
factorised the 2x^3 and the -8x to ger 2x(x^2-4)=-x+4
divided both sides by x^2-4 to get the sum.

Qonfused · Dec 10, 2005

What's the answer to /+*+*/+/+**+*/5624756+*/1-*/717179+1707+01+?

Sulkdodds · Dec 10, 2005

Math is a bastard.

Math!! ^_^

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