I am stumped

This question has three parts: So I am making it 5 credits for that reason.

a. Show that the hypotheses "I left my notes in the library or I finished the rough draft of the paper" and "I did not leave my notes in the library or I revised the bibliography" imply that "I finished the rough draft of the paper or I revised the bibliography".

b. Using c for "it is cold" and d for "it is dry", write "It is neither cold nor dry" in symbols.

c. Show that the premises "Everyone who read the textbook passed the exam", and "Ed read the textbook" imply the conclusion "Ed passed the exam".