This book is an elementary introduction to numerical analysis and scientific computing, intended for undergraduate students in engineering and science. It presents basic concepts and methods in numerical linear algebra, error analysis, and the solution of nonlinear equations. The content of the volume is organized into 13 chapters and three appendices. The first three chapters provide an extensive preamble to the book, introduce notations, and yield an ample résumé on basic linear algebra, polynomials, and algebraic equations. [...]