All real numbers
Explanation:
Here we have the following constant function:
[tex]f(x)=5[/tex]
A constant function is that given by the form:
[tex]f(x)=c \\ \\ c:A \ real \ number[/tex]
So this means we will have a line that passes through the y-values c and is parallel to the x-axis. For this type of functions the domain is:
All real numbers
Learn more:
Direct variation: https://brainly.com/question/10005560
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