Question #N966

The function $f(x) = \sqrt{x}$ is defined for all $x \ge 0$. What is the value of $f(16)$?
A. 2
B. 4
C. 8
D. 16

Correct Answer is: B

The function $f(x) = \sqrt{x}$ means that the output of the function is the square root of the input. Therefore, $f(16) = \sqrt{16} = 4$.