CC-CE multistage amplifier
Since this is bias question, you need to use a large signal model.  Since it is a hand calculation, use a very simple large signal model.  Let use a voltage source of 0.7V from VB to VE and a current source of from C to E that is Beta time IB.  I'm actually going to do something simpler and assume IC = IE.  since Vo is 0, IC =15/150=100mA.  I'm going to say IE is also 100mA but you can use 101 if you want to include the base current.  I think it is to small to matter here.  So VE2=0.1*100-15=-5V. Now add each transistors 0.7v VBE to get VB1= -3.6V.  Now IR1=(15+3.6)/18000=0.001A approximately.  Since very little of this will go into the base R2=(-3.6+15)/.001=11,400 Ohms.