The domain of a function is the set of input values the function can take, while the range is the set of output values
How to determine the function
The domain is given as:
[tex]x = (-\infty,\infty)[/tex]
The range is given as:
[tex]y = (-\infty,4][/tex]
The functions are not given.
So, I will give a general explanation
For a function to have a domain of [tex](-\infty,\infty)[/tex], then it means that the function extends indefinitely on the x-axis in both directions.
However, a function that has a range of [tex](-\infty,4][/tex] would extend indefinitely on the negative y-axis, and the values of the function would stop at y = 4 on the positive y-axis
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