Write the interface (.h file) of a class Accumulator containing: A data member named sum of type integer. A constructor accepting no parameters. A function named getSum that accepts no parameters and returns an integer. A function named add that accepts an integer parameter and returns no value.

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.