Question 1034192
<pre>
I assume your + means "or".  Most teachers and books use 
"v" for "or",  "&" or "^" for "and".  Your book/professor is
not using standard notation. I also assume your > means &#8835; or -> 

1.  (NvO)&#8835;P
2.  (PvQ)&#8835;R
3.  QvN
4.  ~Q        /R

5.  N         3,4,  Disjunctive syllogism
6.  NvQ         5,  Addition
7.  P         1,6,  Modus ponens
8.  PvQ         7,  Addition
9.  R         2,9,  Modus ponens   

Hope I understood your symbols as you intended.  If not you
can tell me in the thank-you note form below, and I'll get
back to you by email.

Edwin</pre>