algebra 2
posted by Lea .
what is the 6th term of the geometric sequence 2000, 800, 320,..../

Start by taking the ratio of 800/2000
reduce it to 2/5 or .4
multiply 800 times .4 = 320
next multiply 320 times .4
and continue until you get to the 6th term. 
you could do that, or just use the formula for the
nth term of a GS, which is ar^(n1)
6th term = 2000(.4)^5 = 20.48