To get the clear view about the domain and the range of the function, I have plotted the graph of the given function, it is showed in the attachment. From the graph we can conclude that: The domain is all real numbers. That is: (-∞,∞)
The range is all positive real values. That is: [0,∞)
b] Explanation: As the values of x increases, the value of h(x) also increase.