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 Anyone else know how?

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PostSubject: Anyone else know how?   Thu Nov 05, 2009 8:01 pm

I'm wondering if anyone else knows how to do ANY part of my math homework...
(I can, but that's because it's my homework, so I SHOULD know how to do it)

Code:

Simplify:

(x+9)/(x+10) - 3x/(x-1)
/ is a fraction bar

That's only one of the easy ones! Wink
Oh, and "Simplify:" is seriously all the directions it gives at the top of the page...
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PostSubject: Re: Anyone else know how?   Thu Nov 05, 2009 10:12 pm

Uhhh...

I could, but I just did 30 problems of MY Algebra homework, which is only like 12.9x + 19(4x + 7) = 16x - 18

Yeah...

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PostSubject: Re: Anyone else know how?   Fri Nov 06, 2009 12:28 am

I could if i would think hard right now, but i dont feel like it. I can do it, but ive never been good at simplifying.
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PostSubject: Re: Anyone else know how?   Fri Nov 06, 2009 2:04 pm

(x+9)/(x+10) - 3x/(x-1)
x+9/x+10 - 3x/x-1

Sorry, but thats as far as I can get.
I could go furthur if the - in the middle was an =.

My maths HW is quite hard, were doing pi and stuff like that right now.
There was one, its

What is the area (NOT VOLUME) of the curved side on a cilander if:
The hieght, when standing on end, is 9cm
The diameter of the circles is 6.8cm

Obviously, we would of had a diagram, but hey
See if you can do that. (with a calculator)

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PostSubject: Re: Anyone else know how?   Fri Nov 06, 2009 3:20 pm

I can do that!

we know that C * H = A, so we need to find the circumference. I know that is pi R squared, so i divide the diameter by 2, to get 3.4. Then, 3.4*3.4*pi.
That gets me 36.2984, so that is my circumference. Now i multiply that by 9 to get the area. Now i know that A = 326.6856.

Your answer is A = 326.6856.

An example of some homework that ive had to do is this:

-12 = 10.5 + r/3

(r/3 is a fraction, not division in the problem, i just had to show it that way)

Can you guys do that?
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PostSubject: Re: Anyone else know how?   Fri Nov 06, 2009 6:11 pm

No, I'm not even near those types of problems yet.

Although my Dad screwed Pi into my head, (or at least like the 1st 50 numbers) and it's there forever. Pi is

3.14159265358979323846264338327950288...

That's all I memorized for now.

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PostSubject: Re: Anyone else know how?   Fri Nov 06, 2009 8:45 pm

Wait, isn't Pi, uhh, wait, umm, like, uhh...
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PostSubject: Re: Anyone else know how?   Fri Nov 06, 2009 8:47 pm

T-t-t-today, junior!

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PostSubject: Re: Anyone else know how?   Fri Nov 06, 2009 9:29 pm

We learned this a while ago.
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PostSubject: Re: Anyone else know how?   Fri Nov 06, 2009 10:16 pm

Yeah, geometry was like in 3rd grade for me...

Well, here's the answer to mine:

Code:
Simplify:

(x+9)/(x+10) - 3x/(x-1)

First Step, multiply the denominators to get a common denominator:

Code:
(x+9)(x-1)/(x+10)(x-1) - 3x(x+10)/(x+10)(x-1)

Second Step, FOIL out the numerators so that it will be easier to add/subtract:

Code:
x^2+8x-9/(x+10)(x-1) - 3x^2+30x/(x+10)(x-1)

Third Step, add or subtract as necessary:

Code:
-2x^2-22x-9/(x+10)(x-1)

It's kinda long, but that's still only one of the easy ones...
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PostSubject: Re: Anyone else know how?   Sat Nov 07, 2009 11:14 am

When I saw what Pi was to like the 100,000,000,000 decimals, my computer crashed.
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PostSubject: Re: Anyone else know how?   Sat Nov 07, 2009 7:17 pm

What are u talking about LN?
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PostSubject: Re: Anyone else know how?   Sat Nov 07, 2009 11:32 pm

Since you guys are talking about pi.... I thought I might sing a song about pi for you! XD

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PostSubject: Re: Anyone else know how?   Sun Nov 08, 2009 9:00 am

What the heck is this? A musical rehearsal?

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PostSubject: Re: Anyone else know how?   Sun Nov 08, 2009 5:03 pm

lol, i just found it on YT
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PostSubject: Re: Anyone else know how?   Sun Nov 08, 2009 9:54 pm

Da pie song!
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