Answer
$a_{10}=-\frac{1}{4096}$
Work Step by Step
$a_n=a_1r^{n-1}$
$a_1=64,~~r=-\frac{1}{4}$
$a_{10}=64(-\frac{1}{4})^{10-1}=64(-\frac{1}{4})^{9}=64(-\frac{1}{262144})=-\frac{1}{4096}$
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