As given by the question
There are given that function
[tex]f(x)=7.75+0.804x[/tex]Now,
First find the domain of the given function.
Then,
The domain of the function, where the given function is defined.
So,
The domain is:
[tex](-\infty,\text{ }\infty)[/tex]And,
The range of the function is defined for the set of values that correspond with the domain.
So,
The range of the given function is
[tex](-\infty,\text{ }\infty)[/tex]