The domain of a function is the set of all its allowable inputs.
The domain convention states that if the domain of a function is not specified,
then it is assumed to be the set of all real numbers for which the function is defined.
The range of a function is the set of all its outputs, as the inputs vary through the entire domain.
The domain of a function $\,f\,$ is denoted by $\,\text{dom}(f)\,$.
The range of a function $\,f\,$ is denoted by $\,\text{ran}(f)\,$.
Since the domain and range are sets, correct set notation must be used when reporting them.
It may be helpful to review interval and list notation.
Remember that the symbol
$\,\mathbb{R}\,$
denotes the set of real numbers.
The domain of a function is usually quite easily determined from the formula for the function.
Numbers that cause division by zero must be excluded from the domain.
Anything inside an even root (square root, fourth root, etc.) must be greater than or equal to zero.
The range of a function is usually more difficult to determine from a formula.
Often, it is much easier to get the range from a graph of the function
(which is the topic of a future section).
In this exercise, you are only asked to find the range for very simple functions.
CONCEPT QUESTIONS EXERCISE:
On this exercise, you will not key in your answer.However, you can check to see if your answer is correct. 
PROBLEM TYPES:
