Evaluate each expression using the graphs of $y=f(x)$ and $y=g(x)$ shown below.

a$.f(g(4))$

b$.g(f(2))$

c$.H(g(6))$

d$.g(f(9))$

e$.f(f(3))$

f$.g(f(g(2)))$

a$.f(g(4))=($Type a whole number.$)$

b$.g(t(2))=($Type a whole number.$)$

c$.1(g(6))=($Type a whole number.$)$

d$.g(t(9))=($Type a whole number.$)$

e$.f(f(3))=($Type a whole number.$)$

$4.$ the $12$