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how do you type the infinity sign on a graphing calculator ?

Mathematics
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1E99
i just write it out ?
it says error

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Other answers:

thats calculator for: 1x10^(99)
which model
TI - 84 plus
your comma button has an EE atop it, shift to get it
oh i see it now , hold up
Do you have a TI-89? These bad boys have an infinity BUTTON!! :D
oh no i have a 84 /:
ti84 is the most ill go ... after that they started having to have terabytes for the instruction manuals and i gave up :)
@amistre64 it says EE but you said it was IE99
Same thing :)
it not my fault they cant type lol
Button likely says EE, but on screen it should say E
ok lemme try
the output on the screen is still: one: 1 2nd, , : E 99: 99
is it a one or an I ?
they might have done that to distinguish it fromthe alpha E key :/
an i is not a real numerical value
"Imaginary"
i^k is one of 4 values ... why are you needing an infinity?
Find the sum of the infinite geometric series, if possible. Show steps, if possible. \sum_{{j}={1}}^{\infty}4 \cdot 0.5^{j-1}
hold up
\[\sum_{{j}={1}}^{\infty}4 \cdot 0.5^{j-1}\]
\[\sum_{{j}={1}}^{\infty}4 \cdot 0.5^{j-1}\] \[\sum_{{j}={1}}^{\infty}4 \cdot 0.5^{j}~.5^{-1}\] \[\frac{4}{.5}\sum_{{j}={1}}^{\infty}0.5^{j}\]
aha now what ? lol
is .5 less than 1?
theres a formula for this ....
yes
whats the formula ? im sorry my teacher doesnt give me all this info /:
\[\frac{1-r^k}{1-r}\] if r < 1, then the limit as k to infinity is \[\frac{1}{1-r}\]
whats r though ? the common ratio ?
but would it be possible to find the sum ?
let me rechk my thought tho ... S = r + r^2 + r^3 + ... + r^n -rS = - r^2 - r^3 - ... - r^n - r^(n+1) ----------------------------------- (1-r)S = r + 0 ..........................- r^(n+1) S= r - r^(n+1) ----------- 1 - r
if r < 1 then that exponented part goes to 0 leaving us: S = r/(1-r) for the sum
might be better stated the |r| < 1, but why nitpick
\[\frac{4}{.5}\sum_{{j}={1}}^{\infty}0.5^{j}\] \[\frac{4}{.5}~\frac{.5}{1-.5}\] \[\frac{4}{.5}=8\]
http://www.wolframalpha.com/input/?i=sum+4%28.5%29%5E%28n-1%29%2C+n%3D1+to+inf
thanks soooo much !
youre welcome, as far as i know the ti84 does not have an infinite sum function
yes im aware haha

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