Question 1050201
1.  (R v G) -> Z ------------------hypothesis
2.  ~(RvG) v Z --------------------material implication
3.  (~R ^ ~G) vZ ------------------de Morgan's
4. (~RvZ)^(~GvZ) ------------------distributivity
5. ~R v Z ------------------------simplification
6. R -> Z ------------------------material implication
7. R ^ I -------------------------hypothesis
8. R -----------------------------simplification
9. Z -----------------------------modus ponens on #6 and #8
10. Z v ~W -----------------------addition property of v