Question

PLEASE HELP

Answer 1

Substitute the values of x from the domain to the equation of the function:
$f(x)=12-3x\\\\f(-4)=12-3(-4)=12+12=24\\f(-2)=12-3(-2)=12+6=18\\f(0)=12-3(0)=12-0=12\\f(2)=12-3(2)=12-6=6\\f(4)=12-3(4)=12-12=0$

Answer: d. {0, 6, 12, 18, 24}