I need help with those problems. Please!!!

1. Write nuclear equations for the following processes: A) Tin-134 emits a beta particle B) Silver-107 captures a positron C) Nickel-63 produces an alpha particle 2. Tin 51 decays to produce cadmium 47. A certain rock sample contains 0.256 g of tin 51 and 8.72 g of cadmium 47. If tin 51 has a half life of 6,500 years, how old is the rock sample? 3. Technitium-104 has a half life of 18.0 minutes. If you started with 180 9, how much is left after 12 hours