Answer
$t = 0$
Work Step by Step
Note: A number to the power of $0$ will always $= 1$.
$(\frac{2}{3})^{t} = 1$
$t = 0$
Check:
$ (\frac{2}{3})^{0}$
$= (\frac{2^{0}}{3^{0}})$
$= \frac{1}{1}$
$ = 1$
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