Sometimes, a number will contain two negative signs. For example, (5) means the opposite of 5. The opposite of 5 Therefore, (5) 5. Why does this make sense? Draw a number line to visualize it. Note The opposite of a negative number is a positive number. Example: The opposite of 8 is (8) 8. This means “the opposite of.” Find the opposite of each number. a) 15 b) 0.8 c) 3 4 d) 2 1 6 Solution Number Opposite a) 15 (15) 15 b) 0.8 (0.8) 0.8 c) 3 4 a 3 4 b 3 4 d) 2 1 6 a2 1 6 b 2 1 6 EXAMPLE 6 Notice the use of parentheses! YOU TRY 6 Find the opposite of each number. a) 38 b) 8.1 c) 11 15 d) 4 5 9 Check your answers manually first! ANSWERS TO YOU TRY EXERCISES 1) a) 24 3 b) 2524 232221 0 1 2 3 4 5 23 4 3 4 2524 232221 0 1 2 3 4 5 c) 231 2 11 2 2524 232221 0 1 2 3 4 5 d) 22.75 4.75 2524 232221 0 1 2 3 4 5 2) a) b) c) d) e) 3) a) ; 2 5 8 26 1 24 232221 0 1 2 3 4 b) ; 3 211 212 4 24 232221 0 1 2 3 4 c) ; 24.5 24.1 2524 232221 0 1 2 3 4 5 4) a) 13 b) 5 c) 8 d) 14 5) a) 19 b) 7 10 c) 4.6 d) 5 1 6 6) a) 38 b) 8.1 c) 11 15 d) 4 5 9 722 CHAPTER 10 Signed Numbers www.mhhe.com/messersmith
messersmith_power_basic_college_1e_ch4_7_10
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