SOLUTION: Find the nth term formula for the geometric sequence whose first term is 18 and whose second term is 9.

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Question 38237: Find the nth term formula for the geometric sequence whose first term is 18 and whose second term is 9.

Answer by stanbon(48568) About Me  (Show Source):
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Find the nth term formula for the geometric sequence whose first term is 18 and whose second term is 9.
nth term formula a(n)=ar^(n-1)
a=18
r=9/18=1/2
nth term is a(n)=18(1/2)^(n-1)
Cheers,
Stan H.