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math

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Jane uses a jar to save her money. She saves $10 from her weekly allowance in the 1st week, $12 in the 2nd week, $14 in the 3rd week, and so on. How much money will she have saved in 10 weeks?

  • math -

    This is an AS with
    a=10
    d=2
    So,

    S10 = 10/2(2*10+9*2) = 190

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