Answer:
15
Step-by-step explanation:
f(x)=5x
g(x)=3x+3
(fog)(x)=f[g(x)]=f(3x+3)=5(3x+3)=15x+15
(fog)(0)=15(0)+15=15
First find g(0) =
g(0) = 3*0 +3
g(0) =3
Then put this into f(x)
f(g(0) ) = f(3) = 5*3 = 15
