Help plzs! algebra simple probabilities

Plzzz i beg u so much asaaaap ! what is the slope of this line? enter your answer in the box.

Its worth 10000000 points need asap if you answer correctly ill mark brainliest

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