Answer:
-40
Step-by-step explanation:
In this problem, we have to find the function of s when x=-4. Simply put, we can replace the x in the function s(x) with -4:
[tex]s(x)=3*-4-28\\s(x)=-12-28\\s(x)=\fbox{-40}[/tex]
I hope this helps! Let me know if you have any questions :)