What does XD mean? I keep seeing people say it and I dont know what it means

For positive constants a and b, the force between two atoms in a molecule is given f(r) = −a r2 + b r3 , where r > 0 is the distance between the atoms. note: a and b are upper case letters. (a) find f '(r) = (b) find the critical point for f(r). r = (c) find f ''(r) = (d) find the value of r so that f ''(r) = 0.

Apart from confidential information, what other information does nda to outline? ndas not only outline confidential information, but they also enable you to outline .

Identify the publisher in this citation: carter,alan.a guide to entrepreneurship.new york: river’2008.print.