Chapter 5 - Number Theory and the Real Number System - 5.2 The Integers; Order of Operations - Exercise Set 5.2 - Page 271: 150

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Using a calculator to evaluate: 8 - 2 x 3 - 9, we can type the problem exactly like it is written. My calculator shows the following on the screen prior to my pressing enter. 8 - (2 * 3) - 9 (Note: Using parenthesis around the multiplication helps ensure that the calculator applies order of operations correctly.)