Suppose a sample of a certain substance decayed to $65\mathrm{.}6$ to of its enginal amount after $300$ diers. $($Round your answers to the

$($d$)$ What is the half$-1/$fe $($in deprs$)$ of this nubstancet

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$($b$)$ Hew long would st take the semple to decter to one$-$third of its original ambunt?

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