Answer:
it is a function
Domain = (- infinity, infinity)
Range = (- infinity, 4]
Step-by-step explanation:
For a function, a vertical line drawn through the graph must not touch it twice. Looking at the graph, a vertical line will not touch the curve twice. Thus, it is a function
The domain of a function is the set of all values of x that satisfies the function. On the graph, it is between the minimum value of x on the left and the maximum value of x on the right. Looking at the graph, it extends infinitely towards the left and right side. Thus,
Domain = (- infinity, infinity)
The range of a function is the set of all values of y that satisfies the function. On the graph, it is between the minimum value of y at the bottom and the maximum value of y at the top. Looking at the graph, it extends infinitely downwards and has a maximum value of 4 at the top. Thus,
Range = (- infinity, 4]