Give the number of "d" electrons

Give the number of electrons associated with the central metal ion in each of the following complexes. The numbers represent the subscripts.

1) K3[Fe(CN)6]

2) [Mn(H2O)6](NO3)2

3) Na[Ag(CN)2]

4) [Cr(NH3)4Br2]ClO4

5) [Sr(EDTA)]2- ----> (The 2- is the charge on the formula)

Please answer these if you can. I need the answers and your help would be greatly appreciated.

1) 5

2) 5

3) 9

4) 3

5) 0