Radioisotope decays to give an alpha particle and protactinium-233. What was the original nucleus?

Can someone me with 1 to 4 plz. fast

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

According to the passage, which of these is true about gray water systems? a) gray water systems use plants that require less water. eliminate b) gray water systems require the use of less fossil fuels. c) gray water systems reduce the amount of fresh water used. d) gray water systems reduce the amount water used by shower heads.