7.3 Mass and Temperature 433 Example 4 Convert to Celsius The temperature at kickoff of a football game was 55°F. What is the equivalent Celsius temperature? Round your answer to the nearest tenth of a degree. Solution We use the formula C F 5 9 ( 32) = − to convert from °F to °C. Substituting F 55 = gives = − = − = ≈ C F 5 9 ( 32) 5 9 (55 32) 5 9 (23) 12.8 Thus, the equivalent temperature is about 12.8°C. 7 Now try Exercise 43 Learning Catalytics Keyword: Angel-SOM-7.3 (See Preface for additional details.) Example 5 Convert to Fahrenheit The gametime temperature of a cricket game in India was 35 C. ° What is the equivalent Fahrenheit temperature? Solution We use the formula F C 32 9 5 = + to convert from C° to F. ° Substituting C 35 = gives = + = + = + = F C 9 5 32 9 5 (35) 32 63 32 95 Thus, the equivalent temperature is 95 F. ° 7 Now try Exercise 51 Instructor Resources for Section 7.3 in MyLab Math • Objective-Level Videos 7.3 • Animation: Identify a Suitable Metric Mass Unit • PowerPoint Lecture Slides 7.3 • MyLab Exercises and Assignments 7.3 Exercises Warm Up Exercises In Exercises 1–8, fill in the blanks with an appropriate word, phrase, or symbol(s). 1. In the metric system the kilogram measures ______. mass 2. The mass of a nickel is about 5 ______. Grams 3. The metric unit that is a little more than 2.2 pounds is the ______. Kilogram 4. A metric tonne is the unit used to express the ______ of a very heavy item, such as a dump truck. Mass 5. Temperatures in the metric system are measured in degrees ______. Celsius 6. The boiling point of water is ______ °C. 100 7. The freezing point of water is ______ °C. 0 8. Normal body temperature is ______ °C. 37 SECTION 7.3 Colin Underhill/Alamy Stock Photo
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