How can these models be used to determine 3.06−2.5

Use the distributive law to multiply. 3(4x + 5y + 6)

What is the missing step in this proof ?

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