Math

The third term of an arithmetic sequence is -12 and the seventh term is 8.what is the sum of the first 10 terms?

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  1. Use your definitions and formulas

    a + 2d = -12
    a + 6d = 8

    subtract the two equations, and find d
    once you have d, go back into the first equation to find a

    then find a + 9d

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