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Condor34

  • one year ago

Find the sum of a 10-term geometric sequence when the first term is 3 and the last term is 59,049 and select the correct answer below. answer choices: 177,147 88,572 88,575 177,144

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  1. anonymous
    • one year ago
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    an=a1⋅rn−1

  2. anonymous
    • one year ago
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    an=3⋅rn−1

  3. anonymous
    • one year ago
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    a10=3⋅r9

  4. anonymous
    • one year ago
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    59049=3⋅r9

  5. anonymous
    • one year ago
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    59049/3=r9

  6. anonymous
    • one year ago
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    19683=r9

  7. anonymous
    • one year ago
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    r=3

  8. anonymous
    • one year ago
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    S10=3(1−310)1−3=88572

  9. condor34
    • one year ago
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    can you help me with another?

  10. anonymous
    • one year ago
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    sure

  11. condor34
    • one year ago
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    Evaluate S5 for 400 + 200 + 100 + … and select the correct answer below. answer choices: 25 775 1,125 500

  12. anonymous
    • one year ago
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    so the rate is 1/2 every time

  13. condor34
    • one year ago
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    and that is s sub 5 or 2_5

  14. anonymous
    • one year ago
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    so the last two numbers are 50 and 25

  15. anonymous
    • one year ago
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    so 400 + 200 + 100 + 50+25

  16. anonymous
    • one year ago
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    775

  17. condor34
    • one year ago
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    thanks

  18. anonymous
    • one year ago
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    yea np

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