The domain is the set of all possible x values for the function; the range is the set of all possible y values.
A linear function is of the form y = m*x + b
An exponential function is of the form y = a*e^(k*x)
Choose values for the constants in these functions, and then graph the functions. By looking at the graph, you should be able to figure out the domain and range of these types of functions.
For example: The domain of a linear function is the set of all real numbers, because the graph of a linear functin is defined for ( -infinity < x < infinity )