A Galois theory example by Brian Osserman

By Brian Osserman

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5) 9 ϩ (Ϫ13) 1 1 32) ` Ϫ ` ϩ 4 4 Applications of Signed Numbers: Write an expression for each and simplify. VIDEO 39) The world’s tallest mountain, Mt. Everest, reaches an elevation of 29,028 ft. The Mariana Trench in the Pacific Ocean has a maximum depth of 36,201 ft below sea level. What is the difference between these two elevations? (Source: Encyclopedia Britannica Almanac, 2004) 40) In 2002, the total attendance at Major League Baseball games was 67,859,176. In 2003, the figure was 67,630,052.

5. Add Real Numbers Subtract Real Numbers Solve Applied Problems Involving Addition and Subtraction Multiply Real Numbers Divide Real Numbers In the previous section, we defined real numbers. In this section, we will discuss adding, subtracting, multiplying, and dividing real numbers. 1. Add Real Numbers Recall that when we add two numbers with the same sign, the result has the same sign as the numbers being added. The sum will have the same sign as the numbers being added. qxd 11/8/10 9:42 PM Page 10 IA— 10 Chapter 1 Real Numbers and Algebraic Expressions Example 1 Add.

Look at the number line, if necessary. Ϫ5 Ϫ4 Ϫ3 Ϫ2 Ϫ1 0 a) 5 __ 1 b) Ϫ4 __ 3 Solution a) 5 Ͼ 1 c) Ϫ1 Ͼ Ϫ5 5 is to the right of 1. 1 2 3 4 5 c) Ϫ1 __ Ϫ5 b) d) Ϫ1 is to the right of Ϫ5. d) Ϫ5 __ Ϫ2 Ϫ4 Ͻ 3 Ϫ5 Ͻ Ϫ2 Ϫ4 is to the left of 3. Ϫ5 is to the left of Ϫ2. ■ You Try 6 Insert Ͼ or Ͻ to make the statement true. a) 4 __ 9 b) 6 __ Ϫ8 c) Ϫ3 __ Ϫ10 Applications of Signed Numbers Example 7 Use a signed number to represent the change in each situation. a) After a storm passed through Kansas City, the temperature dropped 18°.

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