You are jumping on a trampoline. For one jump, your height y (in feet) above trampoline after t seconds can be represented by y=-16^2+24t. How many seconds are you in the air? I need an explanation/work for it!!!

10 points and picture added if there is any confusion in problem

Data for the height of a model rocket launch in the air over time are shown in the table. darryl predicted that the height of the rocket at 8 seconds would be about 93 meters. did darryl make a good prediction? yes, the data are best modeled by a quadratic function. the value of the function at 8 seconds is about 93 meters. yes, the data are best modeled by a linear function. the first differences are constant, so about 93 meters at 8 seconds is reasonable. no, the data are exponential. a better prediction is 150 meters. no, the data are best modeled by a cubic function. a better prediction is 100 meters.