The subject is actually Intro to Logic.There are solutions booklets online if you just google search forallx Cambridge solutions, which might be helpful in understanding what they’re looking for. He normally avoids the questions that have solutions, but feel free to check!These questions are all in the practice exercises. The table of contents is very helpful for navigating even though the numbering can be confusing!
Homework 5-
Chapter 5, Section 23, Part A, evens. - p.105 Using Interpretations
Chapter 5, Section 23, Part B, odds.
Chapter 5, Section 23, Part C, 1,3,5,7,9.
Chapter 5, Section 23, Part D, 1,3,5,7,9.
Chapter 7, Section 31, Part B. - Basic Rules for FOL
Chapter 7, Section 31, Part E, Odds.
Homework 6-
Chapter 4, Section 18, Part B, odds.
Chapter 5, Section 21, Part C, 9, 10, 11, 12.
Chapter 7, Section 31, Part G, evens.
Chapter 7, Section 31, Part H, evens.
Chapter 7, Section 32, Part A, evens.
Chapter 7, Section 33, Part A, pick any four.