if $f(x)=5x + 40$, what is $f(x)$ when $x=-5$?\n-9\n-8\n7\n15

if $f(x)=5x + 40$, what is $f(x)$ when $x=-5$?\n-9\n-8\n7\n15
Answer
Explanation:
Step1: Substitute x value
Substitute (x = - 5) into (f(x)=5x + 40), we get (f(-5)=5\times(-5)+40).
Step2: Calculate the result
First, calculate (5\times(-5)=-25). Then, (-25 + 40=15).
Answer:
D. 15