The height h(t), in feet, of a snowboarder t seconds after beginning a certain jump can be approximated by h(t) = -16t^2 +22.9t + 9. If the
snowboarder lands at a point that is 4 feet below the base of the jump,
determine the airtime (the time the snow boarder is in the air) for this
jump. Round to the nearest tenth of a second.