YOU TRY 4 Perform the operations. a) 24 (3) 7 45 b) 6.2 11.5 (9.6) 14.9 c) 5 8 5 12 1 6 a 2 3 b ANSWERS TO YOU TRY EXERCISES 1) a) 16; 0 b) 1; 0 c) 3 10 ; 0 d) 7.4; 0 2) a) 4 b) 28 c) 18 d) 23 e) 2484 3) a) 2 3 b) 19 36 c) 17.3 d) 2.9 4) a) 59 b) 0 c) 7 24 Using Technology Sometimes we have to make calculations with signed numbers following the order of operations. For example, to calculate 1.2 (8) (0.6) 4, we must work left to right. To fi nd the value of the expression, we enter 1 . 2 8 . 6 4 or 1 . 2 () 8 () . 6 4 ENTER into the calculator. The display screen will show 12.6 as the result. 10.3 Exercises Do the exercises, and check your work. Objective 1: Find the Additive Inverse of a Number 1) How are a number and its additive inverse related on a number line? What is their sum? 2) Is the additive inverse of a number always, sometimes, or never positive? Find the additive inverse of each number. 3) 6 4) 11 5) 23 6) 7 7) 3 8 8) 2 5 9) 5.3 10) 7.9 11) 6 3 11 12) 2 4 9 Objective 2: Subtract Signed Numbers Rewrite the subtraction problem as an addition problem, then perform the operation using the number line. 0 1 2 3 4 5 6 7 8 9 10 13) 6 5 14) 10 3 27262524 232221 0 1 2 3 15) 3 7 16) 2 5 17) 2 3 18) 1 4 2524 232221 0 1 2 3 4 5 19) 3 (6) 20) 2 (2) 21) Explain, in your own words, why 2 (3) is equivalent to 2 3. 738 CHAPTER 10 Signed Numbers www.mhhe.com/messersmith
messersmith_power_basic_college_1e_ch4_7_10
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