Answer
When $t=0$:
$Q=10~grams$
Work Step by Step
$Q=10(\frac{1}{2})^{\frac{t}{5715}}$
When $t=0$:
$Q=10(\frac{1}{2})^{\frac{0}{5715}}=10(\frac{1}{2})^0=10\times1=10$
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