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The quantity of a radioactive substance at time $t$ is

$Q(t)=9(0\mathrm{.}94{)}^t$ grams.

$($a$)$ Find $Q(10)$ and $Q(20).$

Round your answers to one decimal place.

$Q(10)=$

$Q(20)=$

$($b$)$ Find the average of $Q(10)$ and $Q(20).$

Round your answer to two decimal places.

Average $=$