A 30.0 g sample of aluminum is heated to 100°C before being placed in 225.0mL of water. The metal-water combination reaches a final temperature of 13°C. The specific heat capacity of aluminum is 9.2 x 10^2 J/kg°C. What was the initial temperature of the water? Please answer quick!!

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)