Question

state the domain and range of this function.
f(x)=1/x+3

Answer 1

Do you mean:
\[\frac{ 1 }{ x+3 }\] or \[\frac{ 1 }{ x } +3\]

Either way, you can look at the denominator of the fraction and see straight away there will be a value of x that does not work.

Answer 2

so you are saying that the domain is 0?