Solution a) The average low temperature in Fairbanks, Alaska, in February is 28C. This is the only reasonable answer because 28C 18F. The other two choices do not make sense because 10C 50F and 28C 82F. b) A comfortable household temperature is 21C. This is approximately 70F. The other temperatures are too hot: 50C 122F and 68C 154F. YOU TRY 3 Determine which Celsius temperature is appropriate for the situation. a) The oven temperature to bake a cake might be . Choose from 30C, 180C, and 350C. b) The average low temperature in Denver, Colorado, in January is about . Choose from 9C, 15C, and 22C. (www.weather.com) 3 Convert Between Fahrenheit and Celsius Units To convert between Fahrenheit temperature and Celsius temperature, we can use these formulas. Procedure How to Convert Between Fahrenheit and Celsius Temperatures Changing from F to C Changing from C to F C 5(F 32) To change a Fahrenheit temperature (F) to Celsius (C): 1) Substitute the Fahrenheit temperature for F in the formula. 2) Evaluate the expression using the order of operations. 3) Round the answer to the nearest degree, if necessary. Be sure you learn these formulas! EXAMPLE 4 Convert 77F to Celsius. 9 To change a Celsius temperature (C) to Fahrenheit (F): 1) Substitute the Celsius temperature for C in the formula. 2) Evaluate the expression using the order of operations. 3) Round the answer to the nearest degree, if necessary. Solution To change from degrees Fahrenheit to Celsius, use C F 9C 5 5(F 32) 9 32 . Substitute 77 for F, and simplify. C 5(F 32) 9 5(77 32) 9 5 5(45) 91 25 Therefore, 77F 25C. www.mhhe.com/messersmith SECTION 7.5 Metric–U.S. Customary Conversions and Temperature 607
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