Surface Currents
Horizontal movements of water that are caused by wind and occur at or near the ocean's surface are called Surface Currents.
Amount of change / original amount - 100%
So hmmm notice the picture below
"x" being how many seconds the object was going
and when y = 0, the object hits the ground, either on the moon or on earth
so, if we set y = 0 on each equation, we'll know when that happen, how long of a "x-value" or seconds it took
i think the second one would be the best estimate.
the rule for rounding is 5+ you would go up and 4 below you would round down, so:
221 -> 200
485 -> 500
562 -> 600
833 -> 800
therefore, 200+500+600+800 is the answer