Can somebody please help me!!

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

In pqr m< p=60 m< q= 30 and m