Answer:
im in 9th grade algerbra 1 and i just learned this a week and a half ago so ill help
Step-by-step explanation:
x=7 so----
f(x)=3x so you substitute the (x) with (7)
f^-1 (x) witch would be f^-1 (7) cause you still put the (7) cause you use it to substitute the (x)
witch that would equal 7 over F
if that helps
