1BASIC CONCEPTS
In this chapter, we review some of the concepts that students are typically expected to know before learning algebra. Although we don't have the space to fully develop these concepts, we point out some common mistakes and other important points that you should keep in mind. Even if you think that you know these topics, we recommend that you work through this chapter.
1.1 Addition, Subtraction, Multiplication, Division
Throughout this book, we use visual models to represent mathematical ideas. One important model is a number line, a line on which each point represents exactly one number. The numbers always increase from left to right. To show the scale, numbers are marked off at equal intervals. We draw an arrow at the end ...
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