I really need help with this question please and thank you

Use the following information to answer the question . A daredevil jumps off the CN Tower and falls freely for several seconds before releasing his parachute . His height , h , in metres , I seconds after jumping can be modelled by the function _ _ _ 4. 9+ + + + 360, before he released his parachute , and by the function _ _ _ 4+ + 142 after he released his parachute . Rounded to the nearest tenth , how Long after jumping did the daredevil release the parachute ? How high was he off the ground ?"