phil question

Construct Truth Tables (short or long) to determine which of the following are valid.

1. Pv(Q->R)        2. Lv~J

Q&~R                     R->J

---                     ----

~P                     L->~R

Extra credit:

Derive:

Q->L              (P&S)v(T->R)

P->M             ~(S&P)

RvP                -----

R->(Q&S)             T->R

-----

~M->L