Ageometric sequence is defined by the equation an = (3)3 − n.

part a: what are the first three terms of the sequence? (1 point)

part b: what is the value of r? (2 points)

part c: what is the value of a11? (2 points)

PART A

The geometric sequence is defined by the equation



To find the first three terms, we put n=1,2,3

When n=1,






When n=2,






When n=3





The first three terms are,



PART B

The common ratio can be found using any two consecutive terms.

The common ratio is given by,





PART C

To find


We substitute n=11 into the equation of the geometric sequence.



This implies that,

Polar coordinates is 8,9