Answer
85%
Work Step by Step
$R(t) = 2.7^{-(1/3)*t}$
$t=.5$
$R(t) = 2.7^{-(1/3)*t}$
$R(.5) = 2.7^{-(1/3)*.5}$
$R(.5)=2.7^{(-1/6)}$
$R(.5)=.8474$
85%
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