What was that referring to? Since your original problem had NO a, b, or n, I don't see how it applies.

Seriously, this is just basic algebra- except for the definition of "geometric sequence" and fifth root, really just arithmetic.

Skeeter and I told you that if the first term in a geometric series is 'a' and "constant ratio" is 'r' then the sixth term is

. Here you are told that the first term is 81, so a= 81, and the six term is 954 so

. Then, as skeeter said,

, by cancelling a "9" in both numerator and denominator. To get rid of that 5th power, take the fifth root:

approximately. Not anything near "17.159"- that's larger than 106/9 already! The fifth root of a number larger than 1 will be much less that the number.

Now that you know that r= 1.638, the four values you need to find are (81)(1.638),

,

, and

.