Question

use the following function rule to find f(4).
f(x) = 9\sqrt{x}
f(4) = \square

Explanation:

Step1: Substitute $x=4$ into function

$f(4) = 9\sqrt{4}$

Step2: Calculate square root of 4

$\sqrt{4}=2$

Step3: Compute final product

$f(4)=9\times2$

Answer:

18