Using Technology Calculators usually have an “opposite key” and it is sometimes confused with the subtraction key. The opposite key is usually labeled as or sometimes (). Remember, the subtraction key is usually labeled . If we want the calculator to display the opposite of 3, we enter 3 or ()3 into the calculator. The display will show 3. This is because 3 is the opposite of 3. Notice that with 3 displayed on the screen, if you press the opposite key again, the display will show 3. This is because 3 is the opposite of 3. 10.1 Exercises Do the exercises, and check your work. Objective 1: Understand Signed Numbers 1) What is a negative number? 2) Is zero a positive number, negative number, or neither? Represent each statement with a signed number. 3) Justine owes $23. 4) Hector’s checking account was overdrawn by $124.56. 5) Gary lost 3 1 2 lb this past week on a reduced-calorie diet. 6) The value of a stock decreased by $2.81/share. 7) Mount Whitney is the tallest mountain in the continental United States and rises 14,494 ft above sea level. (www.nps.gov/seki) 8) The deepest part of Lake Erie is 210 ft below the surface of the water. (www.great-lakes.net) Graph each set of numbers on the number line. 2524 232221 0 1 2 3 4 5 9) 0, 2, 1, 5, 3 10) 1, 0, 4, 4, 5 11) 1 1 4 , 3, 4, ˇ4 1 2 , 3 4 12) 5, 2 1 4 , 1 2 , ˇ2, 3 3 4 13) 4 5 , 3, 2 5 , ˇ2 3 5 , 1 3 4 14) 4 1 4 , 2 5 , 1, 3 3 4 , 2 1 2 15) 2.5, 1.2, 3, 2.8, 0.5 16) 1.8, 3.4, 4, 2.8, 4 17) 0.6, 1.6, 4, 3.5, 2.8 18) 2.5, 3.5, 0.8, 0.3, 4.9 Objective 2: Compare Signed Numbers Fill in the blank with smaller or larger. 19) As you move left on the number line, the numbers get . 20) As you move right on the number line, the numbers get . Fill in the blank with or to compare each pair of numbers. 21) 13 _____ 7 22) 11 _____ 11 23) 4 _____ 3 24) 11 _____ 12 25) 3 _____ 0 26) 0 _____ 12 27) 1 3 _____ 2 5 28) 3 5 _____ 2 3 29) 3 8 _____ 2 7 30) 3 7 _____ 4 9 31) 2 3 _____ 5 6 32) 5 8 _____ 3 5 33) 2 1 2 _____ 2 5 7 34) 3 4 5 _____ 3 7 9 35) 0.25 _____ 0.31 36) 0.3 _____ 0.299 37) 0.028 _____ 0.029 38) 1.055 _____ 1.054 www.mhhe.com/messersmith SECTION 10.1 Introduction to Signed Numbers 723
messersmith_power_basic_college_1e_ch4_7_10
To see the actual publication please follow the link above