What is the value of the fourth term in a geometric sequence for which a1=10 and r =0.5

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9 votes

Answer: 1.25

Explanation:

The explicit formula for the sequence is
a_(n)=10(0.5)^(n-1)

Substituting in n=4,

$a_(4)=10(0.5)^(4-1)=\boxed{1.25}$

James Hudson answered Nov 7, 2023

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