Question

What do rate of change represent ?

Answer 1

Answer : change /time or x/time
When ever the term rate is used the first thing that should come to mind is DIVIDED BY TIME. this is because rate means
X / time . So when the change is specified it can replace x.

Answer 2

ROC is often used when speaking about momentum, and it can generally be expressed as a ratio between a change in one variable relative to a corresponding change in another; graphically, the rate of change is represented by the slope of a line.