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The emergency brake cable in a bus parked on a steep hill
breaks and the bus rolls down the hill. The distance, in feet,
that the bus rolls is represented by the function d(t) = 0.8t²,
where t is in seconds. How many seconds will it take the bus
to hit a tree at the bottom of the hill 320 feet away?
seconds (enter your answer as a whole number)
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Sagot :