Question

What is the domain and range of `f(x)=4`?

Answer 1

Domain: `(-oo,oo)` Range: `{4}`

Explanation:

This is really just a horizontal line. It exists for all values of `x,` in fact, what value of `x` we choose will not change its value.

The domain is then `(-oo, oo)`

The line, however, only exists at `y=4`. There is no interval for the range, range must be `{4}`