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

[Vesayen]

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]

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]

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]

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]

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.

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]

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]

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

[geeslaka]

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

[Guest]

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

[Guest]

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]

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]

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

[Inverse Icarus]

my sisters taking the same test

i studied with her for 4 hours today.

good luck to you both.

[MikeH]

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

[Ecthy]

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