MOSFET amplifier

 

Answers

A)

The substrate of a MOSFET is usually connected to Source voltage unless you want to create a larger threshold voltage for opening the gate channel. Thus the correct answer is V(substrate) =-10 V

B)

The peak-to-peak value for $V_{pp}(D) =9-1 =8 V$

The peak value for the AC is $V_p =V_{pp}/2 =4 V$