Rate Reactions--need help

[Tooth09]

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xp.[CoBr(NH3)52+][OH-]initial rate (M/sec)13.0 x 10-23.0 x 10-21.37 x 10-326.0 x 10-23.0 x 10-22.74 x 10-339.0 x 10-29.0 x 10-21.23 x 10-2
XP CoBr OH rate

1. 3.0 x 10-2 3.0x10-2 1.37x10-3
2. 6.0x10-2 3.0x10-2 2.74x10-3
3. 9.0x10-2 9.0x10-2 1.23x10-2

what is the rate law expression? How do you determine for OH-..please explain thanks..