A 1.0 x 102 mol sample of a compound that undergoes a first order process is known to have a half-life of 15 minutes. How many moles of the sample remain after 45 minutes

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.