may I please get help to understand these problems?

20.77 Assign a systematic name to each of the following ions: (a) [AuCl4] (b) [Fe(CN)6]4 (c) [Fe(H2O)5NCS2+ (d) [Cr(NH3)2(C2O4)2] 20.78. What is the systematic name for each of the following coordination compounds? (a) Cs[FeCl4] (b) [V(H2O)6](NO3)3 (c) [Co(NH3)4Br2]Br (d) Cu(gly)2 20.79 What is the systematic name for each of the following compounds? (a) [Cu(NH3)4]3SO4 (b) Cr(CO)6 (c) K3[Fe(C2O4)3] (d) [Co(en)2(NH3)CN]Cl2 20.80 Write the formula for each of the following compounds: (a) Tetraammineplatinum(II) chloride (b) Sodium hexacyanoferrate(III) (c) Tris(ethylenediamine)platinum(IV) sulfate (d) Triamminetrithiocyanatorhodium(III)