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skate2400

What is the sum of the geometric sequence -4, 24, -144, ... if there are 7 terms? -159,964 -26,661 26,661 159,963 thanks :]

  • one year ago
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  1. GOODMAN
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    So first off, we got a1=-4 We also got n=7

    • one year ago
  2. GOODMAN
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    Now all you need to do is plug into the following formula:|dw:1338943917241:dw|

    • one year ago
  3. GOODMAN
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    r=6

    • one year ago
  4. GOODMAN
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    |dw:1338944054593:dw|

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  5. GOODMAN
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    Solve.

    • one year ago
  6. skate2400
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    a) -159?

    • one year ago
  7. skate2400
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    ?

    • one year ago
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