Answer
The domain is $(-\infty,\infty)$.
The range is $(-\infty, -1]$.
The y-intercept is (0,-1).
Work Step by Step
The domain is a horizontal span from the function's smallest value of x to the function's largest value of x.
The range is a vertical span from the function's smallest value of f(x) to the function's largest value of f(x).
The x-intercepts are all points of a graph when f(x)=0 while the y-intercepts are all points of a graph when x=0. In this case, there is only the y-intercept which is:
$y=-e^0$
$y=-1$