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algebra

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Find S10 for (-1) + (-7) + (-13) + (-19) +...
A. 250
B. -280
C. (-23)
D. 132

C.

  • algebra -

    a = -1
    d = -6
    n = 10
    sum(10) = (10/2)(-2 + 9(-6))
    = 5(-56) = -280

    looks like B)

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