Homework Help: math

Posted by Please help me. on Thursday, March 7, 2013 at 6:23pm.

A ball is thrown upward with an initial velocity of 35 meters per second from a cliff that is 80 meters high. The height of the ball is given by the quadratic equation h = -49t^2 + 35t + 140 where h is in meters and t is the time in seconds since the ball was thrown. Find the time that the ball will be 60 meters from the ground. Round your answer to the nearest tenth of a second.

PS: I know the answer is 9.0 seconds because it is a test question I got wrong, I need steps if anyone can help:)

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