precal question

Question

So if g(8) = 12 and f(12) = 21, then (f ∘ g)(8)=

Answer 1

(f°g)(8) is a "composite function."

(f°g)(8)=f(g(8))

Since g(8)=12, substitute 12 for g(8):

(f°g)(8)=f(12)

Since f(12)=21, substitute 21 for f(12):

(f°g)(8)=21