A parachutist's elevation changes by -56 ft in 8 seconds. What is the change in the parachutist's elevation each second? Her elevation changes [blank] feet each second​

The chs baseball team was on the field and the batter popped the ball up. the equation b(t)=80t-16•16+3.5 represents the height of the ball above the ground in feet as a function of time in seconds. how long will the catcher have to get in position to catch the ball before it hits the ground? round to the nearest second