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9 October, 18:40

Find the sum of the first 12 terms of the sequence. show all work for full credit. 1,-4,-9,-14, ...

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  1. 9 October, 22:20
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    Let's find the rule where.

    1 - (-4) = 5

    -4 - (-9) = 5

    It looks like we are subtracting 5 from the previous number. Since we know the rule, let's write out all.

    1, - 4, - 9, - 14, - 19, - 24, - 29, - 34, - 39, - 44, - 49, - 54; let's add them.

    -318 is the sum
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