Can someone help me answer some of these questions?

How many $20 bills do you need to have to make $280

Adriver from the university of florida women’s swimming and diving team is competing in the in ncaa zone b championships

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