HELP VESAYEN pass his math final tommorow!! If I do bad, I dont get to college

Vesayen · June 19, 2003, 21:50

If I do bad on this exam, I will be unaccepted to the prestigious college I was accepted to..

Studying like mad all day..... a FEW things I jut cant get though! Not in my notes, cant find it on google....... I've called my math teachers house 3 times today LOL! Cant get in touch with him..... I'll be frank-this is the SMARTEST board I ever post on, so im sure SOMEONE here knows at least some of these:

I am having trouble with some things on a ti-83+ calculator. All my notes are notes about MATH: NOT what buttons to hit...

How do I do a scatterplot on it, how do I do a standard deviation, and how do I do a line regression???? Is graphing an exponential anything special, or just graph it(I suspect-proboably a stupid question)

I fiddled for over an hour CANT figure out any of the 3 of these!

Gaps in my notes on a few other things..... You have two variables and several numbers added toghether..... I forgot what its called, but it uses fibonachi's number.... how the heck do I do that? A typical question will give the number, then ask what the "fifth"(example) term will be.

Edit: One thing to add...... there are these problems "f of x"-if you've graduated highschool math you know what im talking about. It has these inane circle things where the sign would be. What are those called, so I can try to look up info on them..... more importantly, do you go right to left when you do those, or left to right like normal?

Whaleboy · June 19, 2003, 21:56

http://mathworld.wolfram.com

If its still up, it helped me a lot with maths when I had a death wish and actually studied it...

Vesayen · June 19, 2003, 22:09

ROAR! I knocked down the line regression thing and standard deviation from someone PM'ingme....... now I just need to worry about the fibonachi's # thing, and those stupid circles......

Vesayen · June 19, 2003, 22:14

I misnamed it...its not fibonachi's # it involves this wierd # pyramid this french guy came up with(he also envisioned the first calculator)

it starts like this:

-------1
------1-1
-----1-2-1
----1-3-3-1
---1-4-6-4-1
1-5-10-10-5-1

Also about the circle thing.......

its not circles..... gah how do I explain this?

they do something like this:

f(x)= 2b o 5c o 4j(pretend the o's are smaller)

then it has under it something like...

f(j)=5*15(more complicated, but same kinda thing)

f(c)=j*4

f(b)=c*10/15

Your supposed to take the result of each mini little equation and plug it into the next one... but the order of it SOMEHOW(dont remember how-DOAH!) is different... I dont think you go left to right like normal, do you got right to left, or some other way?

Urban Ranger · June 20, 2003, 00:43

Quote:

Originally posted by Vesayen
I misnamed it...its not fibonachi's # it involves this wierd # pyramid this french guy came up with(he also envisioned the first calculator)

That's Pascal's triangle. It's for the expansion of (a+b)^x. The top line is when x=0, second line when x=1, etc.

Quote:

Also about the circle thing.......

its not circles..... gah how do I explain this?

they do something like this:

f(x)= 2b o 5c o 4j(pretend the o's are smaller)

then it has under it something like...

f(j)=5*15(more complicated, but same kinda thing)

f(c)=j*4

f(b)=c*10/15

Your supposed to take the result of each mini little equation and plug it into the next one... but the order of it SOMEHOW(dont remember how-DOAH!) is different... I dont think you go left to right like normal, do you got right to left, or some other way?

Stop panicking and try to explain yourself. Hold on, are you talking about parametic equations?

Jaguar · June 20, 2003, 01:14

Quote:

Originally posted by Urban Ranger
That's Pascal's triangle. It's for the expansion of (a+b)^x. The top line is when x=0, second line when x=1, etc.

You ruined my chance to be a know it all net-rat.

Urban Ranger · June 20, 2003, 01:37

Well, if I had known that you were coming along to answer his question, I'd refrain from answering it.

geeslaka · June 20, 2003, 02:24

Quote:

Originally posted by Vesayen
Also about the circle thing.......

its not circles..... gah how do I explain this?

they do something like this:

f(x)= 2b o 5c o 4j(pretend the o's are smaller)

then it has under it something like...

f(j)=5*15(more complicated, but same kinda thing)

f(c)=j*4

f(b)=c*10/15

Your supposed to take the result of each mini little equation and plug it into the next one... but the order of it SOMEHOW(dont remember how-DOAH!) is different... I dont think you go left to right like normal, do you got right to left, or some other way?

This is composition of functions. I can't explain it but I'll use this as an example.
f(x)=2b(5c(4j))
j=75 4j=300
300*4=1200 c=1200
1200*10/15=800 b=800
2*800=1600
f(x)=1600

June 20, 2003, 02:35

he means composition of function
but they would use different variables for functions
best example is this
f(x)=x+2
g(x)=2x
so then f(2) =4
g(2)=4
f o g (2)= f(g(2))=f(4)=6
g o f (2) = g(f(2))=g(4)=8
so you go from right to left
the memory trick is just to let ths o's disappear and glue them with parentheses like above
hope this helps

June 20, 2003, 02:40

about the triangle (Pascal's triangle)
you get a number by adding the top 2 above it.
Explictly the ith number in the jth row is calculated as
i nCr j which is (j)!/((i)!(j-i)!) (if you know factorials)
dont forget to count 0...
so to get that 10, its in the 5th row (starting to count at 0) and is the second one (starting at 0 again) so 2 nCr 5 which is 5!/2!3!= 120/2*6=10

Urban Ranger · June 20, 2003, 04:01

Quote:

Originally posted by LulThyme
he means composition of function
but they would use different variables for functions
best example is this
f(x)=x+2
g(x)=2x
so then f(2) =4
g(2)=4
f o g (2)= f(g(2))=f(4)=6
g o f (2) = g(f(2))=g(4)=8
so you go from right to left
the memory trick is just to let ths o's disappear and glue them with parentheses like above
hope this helps

I like the second form (the inside out) better.

BustaMike · June 20, 2003, 04:02

Just wack off once. You'll be more relaxed after and do fine.

Inverse Icarus · June 20, 2003, 04:43

my sisters taking the same test

i studied with her for 4 hours today.

good luck to you both.

MikeH · June 20, 2003, 04:54

If I do bad? Lucky it isn't an English test.

Ecthy · June 20, 2003, 05:57

I got like 98% in my math final. Thanks for the applause.

Ecthy · June 20, 2003, 05:58

and about the same in the other 3 finals - compsci, politics, english(oral)

*standing ovations for Ecthy*

Urban Ranger · June 20, 2003, 06:28

Wait till you got over 100%

[It is possible. All you need to do is to get all the questions right, and the extra credit question right.]

MikeH · June 20, 2003, 06:47

Not possible in most UK exams. No extra credit questions.

Ecthy · June 20, 2003, 06:48

same in Dtl.

Drogue · June 20, 2003, 08:06

I just finished my last exam that mattered (Economics unit 6)... Just praying I did enouhg for that A, after messing up Maths

Last years maths was so easy, I haven't turned up for quite a few months

Oh well, damn my overconfident self.

Good luck Vesayen. Where is it you're trying to get into?

Ecthy · June 20, 2003, 08:08

790 out of 840, not too shabby

Go, go, go Andy go, go

Vesayen · June 20, 2003, 08:58

Quote:

Originally posted by LulThyme
he means composition of function
but they would use different variables for functions
best example is this
f(x)=x+2
g(x)=2x
so then f(2) =4
g(2)=4
f o g (2)= f(g(2))=f(4)=6
g o f (2) = g(f(2))=g(4)=8
so you go from right to left
the memory trick is just to let ths o's disappear and glue them with parentheses like above
hope this helps

Just right to left?

What I thought-YEY!

Thank you for confirming it though =)

say you have the term (2x+y)^4

so you start off by doing 2x^4y^0(which becomes 1)....

(2x^4*y^0)+(2x^3*y^1)+(2x^2*y^2)+(2x^1*y^3)+(2x^0* y^4)

thats to the fourth power, so you take the fifht level of pascals trinalge(one above the power, right?)....

which is 1,4,6,4,1

Now my question is WHAT do I do with that? I multiple each individual expression in that equation... I just multiple by the correspnding # right?

so (2x^3*y^1) is the is the secone term, so I Just multiply it by 4 to make it 8x^3*4y^1, RIGHT? heh

Drogue · June 20, 2003, 09:16

Yes. The actual formula is called the Binomial Expansion and is basically the corresponding number from pascals triangle (nCr - should be on your calculator):

r!
---------
r! (n-r)!

multiplied by the example you gave above. So you get (2x)^4+4*y*(2x)^3+6*y^2*(2x)^2+4*y^3*2x+y^4 for your example above.

Drogue · June 20, 2003, 09:19

Try http://www.mathsrevision.net/alevel/Binomial.htm if you want. That's the page about this. If n (the power) is not a positive integer (ie a fraction) then use http://www.mathsrevision.net/alevel/...tional%20n.htm instead.

Brundlefly · June 20, 2003, 09:59

Quote:

Originally posted by Vesayen
If I do bad on this exam, I will be unaccepted to the prestigious college I was accepted to..

The problem with providing assistance in a thread like this, is the thought that eventually there will be another thread:

"HELP VESAYEN pass his math final tommorow!! If I do bad, I dont graduate college"

To all of those who posted help, wouldn't it be ironic if this kid got hired to your company right out of college as your supervisor and then every week its:

"HELP VESAYEN get this report out by tommorow!! If I do bad, I dont get a promotion"

Honestly, Vesayen, I don't wish any ill will towards you. My point is that resorting to the internet to have your problem solved is a substitute for doing the brainwork yourself and it is almost like cheating. You would be better off if you did not resort to this.

alva · June 20, 2003, 10:20

Quote:

To all of those who posted help, wouldn't it be ironic if this kid got hired to your company right out of college as your supervisor and then every week its:

"HELP VESAYEN get this report out by tommorow!! If I do bad, I dont get a promotion"

You know any other kind of supervisor??

Vesayen · June 20, 2003, 10:27

Quote:

Originally posted by Feephi
Honestly, Vesayen, I don't wish any ill will towards you. My point is that resorting to the internet to have your problem solved is a substitute for doing the brainwork yourself and it is almost like cheating. You would be better off if you did not resort to this.

Feephi, I dont mean to have any ill will to..... actually I do: screw you

.

Studying for weeks, few little last second things which I cant find in my notes, and I figured the nice(mostly...) people of apolyton could help with. If you think this is wrong, tell someone who cares-I dont and its rediculous for you to judge me over this.

Thanks for those who did give some help, going off to the test now

!