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

## Answer This Question

## Related Questions

- Math - the 12th term in a geometric sequence is 49, and the 14th term is 2401 . ...
- Math - The 5th term of an arithmetic sequence is 22 and the 15th term is 62. ...
- Math - The fifth term of an arithmetic sequence is 22 and the 15th term is 62. ...
- math - he 12th term in a geometric sequence is 49 and the 14th therm is 2401, ...
- Algebra - The fifth term of an arithmetic sequence is 22 and the 15th term is 62...
- math...help please! - I need help figuring this out please! :) Write an equation...
- Math - what is the 15th term of an arithmetic sequence in which the third term ...
- algebra - Could someone check my work; 1. Generate the first five terms in the ...
- algebra - I have 3 questions I need help with. 1) what is the 15th term of the ...
- Math - 1. Find the 12th term of the arithmetic sequence 2, 6, 10, … . 2. Solve ...

More Related Questions