ผู้เขียน: Robert Sadler

Powerful True Story of a Twentieth-Century Plantation Slave Over fifty years after the Emancipation Proclamation, Robert Sadler was sold into slavery at the age of five–by his own father. This is th …

The Pre-Calculus workbook provides students with an overview of the skills in algebra, functions, trigonometry, analytic geometry, and graphical analysis that are crucial to success in higher-level m …