Answer
$s'(t) = -6t$
So,
$s'(-1) = 6$
Work Step by Step
$s(t) = 1-3t^{2}$
Therefore,
$s'(t) = 0 - 3(2)t^{2-1}$
$s'(t) = -6t$
So,
$s'(-1) = 6$
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