Answer:
a13 = 20,480
Explanation:
The first term is a1 = 5, and the common ratio is ...
r = 10/5 = 2
The generic term is ...
an = a1·r^(n-1)
an = 5·2^(n-1)
Then the 13th term is ...
a13 = 5·2^(13 -1) = 5·4094
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