HELP!! I can't figure this out! Position Model Application

jahead02 said:

An arrow is shot straight upward with a velocity of 98 feet per second (ft/sec) from an altitude of 8 feet. For how many seconds is this arrow more than 88 feet high? The altitude of the arrow is given by S = -16t2 + 98t + 8.
(Round your answer to two decimal places.)
Hint:

Solve

88 < -16t^2 + 98t + 8

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