Posted by **reema** on Friday, May 4, 2012 at 9:58pm.

find the 15th term of the sequence

-9,27,-81............

- math -
**bobpursley**, Friday, May 4, 2012 at 10:07pm
sequence is ar^n where a=-9, r=(-3)^n

15 term> is -9 the zeroth term, or first. Let it be first, then r=(-3)^(n-1)

so 15th term...(-9)(-3)^14=-43 046 721

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