Algebra II Part 2

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The equation h=7 cos{pi/3 t} models the height h in centimetres after t seconds of a weight attached to the end of a spring that has been stretched and then released.

Find the times at which the weight is at a height of 1 cm,of 3 cm,and of 5 cm below the rest position for the second time.Round your answer to the nearest hundredth.

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