Question

How do you evaluate `f(x)=lnx` for `x=18.42`?

Answer 1

`f(x)=2.91`

Explanation:

Substitute 18.42 for x in the equation:
`f(x)=ln(18.42)`
Use a calculator:
`f(x)=2.91`
Of course, that is if you're allowed to use a calculator.