Write a method called doubleit that accepts a string parameter and returns that string concatenated with itself. for example, if the parameter is "program", the return value would be "programprogram".

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.

What are "open-loop" and "closed-loop" systems

The gene form of a trait is called a(n)