YOU TRY 4 Convert 41F to Celsius. EXAMPLE 5 Convert 7C to Fahrenheit. Solution To change from degrees Celsius to Fahrenheit, use F 9C 5 32. Substitute 7 for C, and simplify. F 9C 5 32 9(7) 5 32 63 5 32 12.6 32 44.6 Round the answer to the nearest degree: 44.6F 45F. Therefore, 7C 45F. YOU TRY 5 Convert 17C to Fahrenheit. ANSWERS TO YOU TRY EXERCISES 1) 26.2 mi 2) a) 3.5 c 828.1 mL b) 152.4 cm 60 in. c) 9 oz 255.2 g 3) a) 180C (180C 356F) b) 9°C (9°C 16°F) 4) 5C 5) 17°C 63°F Using Technology Fahrenheit to Celsius When converting 91F to Celsius, we use the formula C 5(F 32) 9 and replace F with 91. This gives us the equation C 5(91 32) 9 . Using a calculator to fi nd the value of the right-hand side of the equation, we must follow the order of operations. In this case, we fi rst simplify the expression in the parentheses, then multiply by 5, and then divide by 9. Enter A 9 1 3 2 B 5 9 into the calculator. The display will likely show 32.77777777. Rounding to the nearest tenth, we get 32.8. This means 91°F 32.8°C. Celsius to Fahrenheit When converting 18C to Fahrenheit, we use the formula F 9C 5 32 and replace C with 18. This gives us the equation F 9(18) 5 32. Using a calculator to fi nd the value of the right-hand side of the equation, we must follow the order of operations. In this case, we fi rst multiply 9 by 18, then divide by 5, and then add 32. We now enter 9 1 8 5 3 2 into the calculator. The display will show 64.4. This means 18C 64.4F. 608 CHAPTER 7 Measurement and Conversion www.mhhe.com/messersmith
messersmith_power_prealgebra_1e_ch4_7_10
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