So are you asking for something like 200! but only to 100 and to determine the amount of zeros from the product?
90 - 39 = 51
D. Is the closest answer. Though there is a certain, microbe that allows for import/exports.
So at first, the dog moved 6 meters in one second (velocity = 6 meters/second) then moves 4 meters in one second (velocity = 4 meters/second). You need acceleration or something?
It may not be considered positivity, though it is inspiratonal in a sense.