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9 February, 07:40

Find the 20th term of the arithmetic sequence 7, 3, - 1, - 5, ...

A. - 73

B. - 69

C. 24

D. 69

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Answers (1)
  1. 9 February, 09:50
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    7, 3,-1,-5

    decreased by 4 each time

    arthymetic

    an=a1+d (n-1)

    a1=first term

    d=common diffrence

    n=which term

    first term is 7

    common difference is - 4

    an=7-4 (n-1)

    for 20th term

    a20=7-4 (20-1)

    a20=7-4 (19)

    a20=7-76

    a20=-69

    answer is B
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