Answer
Please see the work below.
Work Step by Step
The IUPAC names are given as
a.$K_3[FeF_6]$
Potassium hexalfuoro ferrate (III)
b. $[Cu(NH_3)_2](H_2O)_2^{+2}$
Diammoine diaqua copper(II) ion
c. $(NH_4)_2[Fe(H_2O)F_5]$
Ammonium aquapenta fluoro ferrate (III)
d. $[Ag(CN_2)]^-$
Dicyanoar gentate (I)ion