Nomor 19 dong plissSssssssssss

(fog)^-1 = g^-1 o f^-1

fungsi fx^-1 masukin ke gx^-1

(fog)^-1     = 3-(x-1/5)/2
fog^-1 ( 6) = 3- ( 6-1/5)/2
                 = 3-(1)/2
                 = 1