They show how to use implication rules to arrive at conclusions directly or indirectly. The first six chapters will test or strengthen your reading, writing and reasoning. Precision reading and reading and writing is needed in mathematics after arithmetic. Chapter 7 includes some arithmetic review problems with hints of algebraic patterns. Have someone check your notation if you do them.
Incorrect notation is a sign of miscomprehension.
Solutions are included online. Chapters 8 to 15 employs words and simple examples to introduce the shorthand roles of letters and symbols in mathematics beyond arithmetic. Chapter 15 shows how to solve linear equations in one, two and three unknowns numerically and sometimes algebraically, that is by general formulas. As a mathematics teacher, I advocates the use of formulas or their derivation to solve many problems at once with at least one exception. Namely, in the solution of linear equations in several unknowns the best approach is not to use the formulas, but to avoid them.