Question

what does dA/dx mean?
as A changes, x also changes?

Answer 1

Yes. The derivative of A with respect to derivative of x.

Answer 2

So.. Acceleration = dv/dt.
The rate of change of velocity in respect to the change in time. (the derivative is rate of change)

Answer 3

Could be area...

Answer 4

dA/dx means the change in A with respect to x, which is a way to say, a change in x causes a change in A. This term is from calculus.

Answer 5

http://en.wikipedia.org/wiki/Derivative