Ineed with problem number 2! you

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

Find x to the nearest hundredth place

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