Question

What does the circle mean? How do I solve this? (See attachment)

Answer 1

Hi :o)

Answer 2

Hola

Answer 3

Again

Answer 4

the circle means it is a composite function

Answer 5

f o g = f(g(n))

Answer 6

it stands for "of", and it means you plug in the g equation into the f one, like this:
f(n)=2n
g(n)=-n-4
(f o g)(n)=f(g(n))=2(-n-4)=-2n-8

Answer 7

Ooooh okay cool beans, thanks.