Agas sample occupies 1.8 l at 25 c and 2.0 atm. what volume will it occupy at stp ?

(1.8 L) x (273 K / (25 + 273) K) x (1.0 atm / 2.0 atm) = 0.82 L

In the first image the fourth box(change) in distance) goes with the first box in the second image (what is speed). The acceleration definition is a change in velocity
You can calculate speed by dividing distance and time
And you can solve acceleration by dividing time by distance