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March 25, 2017

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Write a rule for the nth term of the geometric sequence. Then find a7.

1. 7, -4.2, 2.52, -1.512, ...

  • Math - ,

    7, -4.2, 2.52, -1.512, ...
    Divide successive terms,
    -4.2/7=-0.6
    2.52/-4.2=-0.6
    -1.512/2.52=-0.6
    So the common ratio is r=-3/5
    T(1)=7
    T(n)=7r^n
    T(7)=7(-3/5)^7
    =-15309/78125
    =-0.196 approx.

  • Math - ,

    how do you

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