e in seconds and f(t) represents the height of the roller coaster.  Determine the four times at which the roller coaster

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A portion of the path of a certain roller coaster can be modelled by f(t) = t4 - 30t/ 291t2 -1070t / 1200, where t represents the time in seconds and f(t) represents the height of the roller coaster.  Determine the four times at which the roller coaster is at ground level.  The answer must be arranged in increasing order and use comma as a separator.

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Introduction:

zeros of any function are the points where the values of the function are zero.

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