Answer:
A. 81
Step-by-step explanation:
F(x)=
if x=4, then F(4) = = 3×3×3×3=81
hihigigigigigigigi
30x = 9(2x+6)
30x = 18x+54
30x-18x = 54
12x = 54
x = 54/12
= 27/6
I think is 27pi because if you divide 27 by 3 is 9