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wendylisette Group Title

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

  • 9 months ago
  • 9 months ago

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  1. amistre64 Group Title
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    1E99

    • 9 months ago
  2. wendylisette Group Title
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    i just write it out ?

    • 9 months ago
  3. wendylisette Group Title
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    it says error

    • 9 months ago
  4. amistre64 Group Title
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    thats calculator for: 1x10^(99)

    • 9 months ago
  5. Decart Group Title
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    which model

    • 9 months ago
  6. wendylisette Group Title
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    TI - 84 plus

    • 9 months ago
  7. amistre64 Group Title
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    your comma button has an EE atop it, shift to get it

    • 9 months ago
  8. wendylisette Group Title
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    oh i see it now , hold up

    • 9 months ago
  9. austinL Group Title
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    Do you have a TI-89? These bad boys have an infinity BUTTON!! :D

    • 9 months ago
  10. wendylisette Group Title
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    oh no i have a 84 /:

    • 9 months ago
  11. hihi67 Group Title
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    lol @austinL

    • 9 months ago
  12. amistre64 Group Title
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    ti84 is the most ill go ... after that they started having to have terabytes for the instruction manuals and i gave up :)

    • 9 months ago
  13. wendylisette Group Title
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    @amistre64 it says EE but you said it was IE99

    • 9 months ago
  14. austinL Group Title
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    Same thing :)

    • 9 months ago
  15. amistre64 Group Title
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    it not my fault they cant type lol

    • 9 months ago
  16. austinL Group Title
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    Button likely says EE, but on screen it should say E

    • 9 months ago
  17. wendylisette Group Title
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    ok lemme try

    • 9 months ago
  18. amistre64 Group Title
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    the output on the screen is still: one: 1 2nd, , : E 99: 99

    • 9 months ago
  19. wendylisette Group Title
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    is it a one or an I ?

    • 9 months ago
  20. amistre64 Group Title
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    they might have done that to distinguish it fromthe alpha E key :/

    • 9 months ago
  21. amistre64 Group Title
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    an i is not a real numerical value

    • 9 months ago
  22. austinL Group Title
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    "Imaginary"

    • 9 months ago
  23. amistre64 Group Title
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    i^k is one of 4 values ... why are you needing an infinity?

    • 9 months ago
  24. wendylisette Group Title
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    Find the sum of the infinite geometric series, if possible. Show steps, if possible. \sum_{{j}={1}}^{\infty}4 \cdot 0.5^{j-1}

    • 9 months ago
  25. wendylisette Group Title
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    hold up

    • 9 months ago
  26. wendylisette Group Title
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    \[\sum_{{j}={1}}^{\infty}4 \cdot 0.5^{j-1}\]

    • 9 months ago
  27. amistre64 Group Title
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    \[\sum_{{j}={1}}^{\infty}4 \cdot 0.5^{j-1}\] \[\sum_{{j}={1}}^{\infty}4 \cdot 0.5^{j}~.5^{-1}\] \[\frac{4}{.5}\sum_{{j}={1}}^{\infty}0.5^{j}\]

    • 9 months ago
  28. wendylisette Group Title
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    aha now what ? lol

    • 9 months ago
  29. amistre64 Group Title
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    is .5 less than 1?

    • 9 months ago
  30. amistre64 Group Title
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    theres a formula for this ....

    • 9 months ago
  31. wendylisette Group Title
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    yes

    • 9 months ago
  32. wendylisette Group Title
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    whats the formula ? im sorry my teacher doesnt give me all this info /:

    • 9 months ago
  33. amistre64 Group Title
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    \[\frac{1-r^k}{1-r}\] if r < 1, then the limit as k to infinity is \[\frac{1}{1-r}\]

    • 9 months ago
  34. wendylisette Group Title
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    whats r though ? the common ratio ?

    • 9 months ago
  35. wendylisette Group Title
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    but would it be possible to find the sum ?

    • 9 months ago
  36. amistre64 Group Title
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    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

    • 9 months ago
  37. amistre64 Group Title
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    if r < 1 then that exponented part goes to 0 leaving us: S = r/(1-r) for the sum

    • 9 months ago
  38. amistre64 Group Title
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    might be better stated the |r| < 1, but why nitpick

    • 9 months ago
  39. amistre64 Group Title
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    \[\frac{4}{.5}\sum_{{j}={1}}^{\infty}0.5^{j}\] \[\frac{4}{.5}~\frac{.5}{1-.5}\] \[\frac{4}{.5}=8\]

    • 9 months ago
  40. amistre64 Group Title
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    http://www.wolframalpha.com/input/?i=sum+4%28.5%29%5E%28n-1%29%2C+n%3D1+to+inf

    • 9 months ago
  41. wendylisette Group Title
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    thanks soooo much !

    • 9 months ago
  42. amistre64 Group Title
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    youre welcome, as far as i know the ti84 does not have an infinite sum function

    • 9 months ago
  43. wendylisette Group Title
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    yes im aware haha

    • 9 months ago
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