Exam Question in Sentential Logic

This semester, I'm taking a class in deductive logic at The University of Maryland, Baltimore County (UMBC). Below is my answer to a question on our second exam (construct a derivation of the conclusion in line 2 from the premise in line 1). The exam covered derivations in sentential logic, based on Gary M. Hardegree's Symbolic Logic: A First Course, second edition (New York: McGraw-Hill, 1999). The annotation to the right of each line shows the justification for its presence in the derivation, with "Pr" standing for premise, "CD" standing for conditional derivation, "As" standing for assumption, "ID" standing for indirect derivation, "DD" standing for direct derivation, and "X" standing for contradiction.

Below is my answer to another question.

Brandon Terry presents "Shattered Dreams, Infinite Hope: A Tragic Vision of the Civil Rights Movement"

Philosopher Brandon Terry, talking about his new book, "Shattered Dreams, Infinite Hope: A Tragic Vision of the Civil Rights Movement," at Red Emma's bookstore, in Baltimore.

Meeting Brandon Terry.

Brandon Terry is John L. Loeb Associate Professor of the Social Sciences at Harvard University and Codirector of the Institute on Policing, Incarceration, and Public Safety at the Hutchins Center for African and African American Research. His new book is a ground-breaking work of scholarship exploring the varying interpretations of the civil rights movement that are found in contemporary politics and offering a new vision of what the civil rights movement has been and what it can still be.