math,correction

can someone correct this for me thanks

A ball is thrown upward from the roof of a building 100 m tall with an initial velocity of 20 m/s. Use this information for exercises 35 to 38.
Science and medicine. When will the ball reach a height of 80 m?

h = -5t^2+20t+100

My answer: t= 4.83 s




correct.

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