What is the sixth term of the geometric sequence? Geometric sequence represented by a graph in quadrant 1 with n on x axis and a sub n on y axis. Points at one comma eighty one, two comma nine, and three comma one.

Hint: an = a1(r)n − 1, where a1 is the first term and r is the common ratio

a sub six equals start fraction one over 729 end fraction
a sub six equals start fraction one over 6,561 end fraction
a sub six equals start fraction one over nine end fraction
a6 = −26