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anonymous

  • one year ago

here are three geometric series. a) 2+1+0.5+... b) 75+30+12+... c) 240-60+15-3.75+.... 1) For each of the series i) find the common ratio r ii) use GDC to calculate the values of S10, S15, S20. Write full values that you see on your GDC screen 2) Do you notice any patterns? why do you think this is happening 3) Now use your GDC to calculate the values of S50 for each series. Do you think your calculator is correct? Explain why or why not

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  1. anonymous
    • one year ago
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    What is GDC?

  2. anonymous
    • one year ago
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    grafic calculator

  3. ParthKohli
    • one year ago
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    \[S(n) = a\frac{1-r^n}{1-r }\]

  4. anonymous
    • one year ago
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    so how do you answer the queston

  5. anonymous
    • one year ago
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    you can divide the second term by the first to find r. \[r=\frac{a_2}{a_1}\] So for the first one r = 1/2

  6. ParthKohli
    • one year ago
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    \[S(10) = a\frac{1 - r^{10}}{1-r }\]

  7. ParthKohli
    • one year ago
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    \[S(15) = a\frac{1-r^{15}}{1-r}\]

  8. ParthKohli
    • one year ago
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    \[S(20) = a\frac{1 - r^{20}}{1-r}\]

  9. anonymous
    • one year ago
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    ok thansks

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