Find the (a) domain and b(range), and c(graph the function.)

1. y=|x|-2

2. y= Radical(16-x^2) Radical= Square root symbol and numbers are under radical.

3. y=2e^-x - 3

4. y=2sin(3x + Pi) -1

5. y= ln(x-3) + 1

Couple problems i'm trying to figure out. Disregard part C, I've already done that. how do you find the domain, range for these kinds of problems?(process). Any help would be extremely appreciated