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skate2400

  • 3 years ago

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 :]

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

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

  3. GOODMAN
    • 3 years ago
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    r=6

  4. GOODMAN
    • 3 years ago
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    |dw:1338944054593:dw|

  5. GOODMAN
    • 3 years ago
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    Solve.

  6. skate2400
    • 3 years ago
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    a) -159?

  7. skate2400
    • 3 years ago
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    ?

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