Answer:
see below
Step-by-step explanation:
You know the relationship between the explicit rule and the recursive rule for a geometric sequence is ...
[tex]\text{explicit rule: }a_n=a_1\cdot r^{n-1}\\\\\text{recursive rule: }a_n=a_{n-1}\times r,\ \text{$a_1$ is the same}[/tex]
The given explicit rule tells you a1 = 20, r = 3, so you know the recursive rule is the one shown below.
