82 Chapter 1 The Set of Real Numbers Calculator Connections Topic: Operations with Signed Numbers on a Calculator Most calculators can add, subtract, multiply, and divide signed numbers. It is important to note, however, that the key used for the negative sign is different from the key used for subtraction. On a scientific calculator, the key or key is used to enter a negative number or to change the sign of an existing number. On a graphing calculator, the key is used.These keys should not be confused with the key which is used for subtraction. For example, try simplifying the following expressions. a. 7 142 6 b. 3.1 10.52 1.1 Scientific Calculator: Enter: 7 4 6 Result: Enter: 3.1 0.5 1.1 Result: Graphing Calculator: 17 1.5 Calculator Exercises Simplify the expression without the use of a calculator.Then use the calculator to verify your answer. 1. 13 2. 2 3. 711 4. 8 152 4 152 112 627 1842 0.06 0.12 0.18 5. 3.2 114.52 17.7 6. 472 15182 990 7. 12 9 4 17 8. 209108 1632 38 Section 1.4 Practice Exercises For additional exercises, see Classroom Activities 1.4A–1.4C in Study Skills Exercise the Student’s Resource Manual at www.mhhe.com/moh. Some instructors allow the use of calculators.What is your instructor’s policy regarding calculators in class, on the homework, and on tests? Helpful Hint: If you are not permitted to use a calculator on tests, it is a good idea to do your homework in the same way, without a calculator. Vocabulary and Key Concepts 1. a. The expression a b is equal to a . b. If a is positive and b is negative, then the difference a b will be (choose one: positive or negative). Review Exercises For Exercises 2–5, translate each English phrase into an algebraic expression. 2. The square root of 6 3. The square of x 16 x2 4. Negative seven increased by 10 7 10 5. Two more than b b 2 positive b Writing Translating Expression Geometry Scientific Calculator Video
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