Question

19/20
$f(x)=4x+5$
$f(4)=$
21
-11
-31
25

Explanation:

Step1: Substitute x=4 into f(x)

$f(4)=4\times4+5$

Step2: Calculate multiplication first

$4\times4=16$

Step3: Calculate final sum

$16+5=21$

Answer:

21