Answer:
tn = 243·(1/3)^(n-1)
Step-by-step explanation:
The recursive formula tells you the first term (243) and the common ratio (1/3). You can put these numbers into the general formula for the n-th term of a geometric sequence:
an = a1·r^(n-1) . . . . . where a1 is the first term and r is the common ratio
You want the n-th term of your sequence to be called tn, so ...
tn = 243·(1/3)^(n-1)
