##### Question Info

This question is public and is used in 98 tests or worksheets.

Type: Multiple-Choice
Standards: HSF-IF.A.2
Author: mathwriter

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If $f(x)=sqrt{x-4}$, evaluate $f(20)$.
1. $sqrt{20}$
2. $4$
3. $sqrt{16}$
4. $2sqrt{5}$