Answer:
a(n) = 180·(1/6)^(n-1)
Step-by-step explanation:
The generic formula for a geometric sequence is ...
a(n) = a(1)·r^(n-1)
Your sequence has a first term of a(1)=180 and a common ratio of r=-1/6, so the explicit formula is ...
a(n) = 180·(1/6)^(n-1)
