Question

What is the range of the function (e^x)/(e^x)+c? Assume that c is a constant greater than zero.

Answer 1

Try this explanation:
1. if to re-write the given function as:
$y= \frac{e^x}{e^x+C}; \ \ \textless \ =\ \textgreater \ \ y=1- \frac{C}{e^x+C};$
then it is possible to define its range:
2)   
$\lim_{x \to+ \infty}[1- \frac{C}{e^x+C}]=1; \\ \lim_{x \to- \infty}[1- \frac{C}{e^x+C}]=0$

answer: (0;1)