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. 7.5 Exercises Do the exercises, and check your work. Objective 1: Convert Between U.S. Customary and Metric Units Convert to the indicated unit. Round the answer to the nearest tenth, if necessary. Use the table on p. 472. 1) 50 ft to meters 2) 100 yd to meters 3) 200 yd to meters 4) 100 ft to meters 5) 2 c to milliliters 6) 3 gal to liters 7) 4 kg to pounds 8) 150 g to ounces 9) 70 cm to inches 10) 120 km to miles 11) 6 1 2 qt to liters 12) 2.4 gal to liters 13) 40 mi to kilometers 14) 7 in. to centimeters 15) 18 cm to inches 16) 130 km to miles 17) 63 kg to pounds 18) 470 g to ounces 19) 12.6 oz to grams 20) 23 3 4 lb to kilograms 21) 11 L to gallons 22) 7 L to quarts 23) 39 m to yards 24) 15 m to feet For Exercises 25–28, convert to the indicated metric unit: a) using the values in the table on p. 472 to get an approximation of the equivalent metric unit. b) using the exact relationships of 1 ft 12 in., 1 yd 36 in., 1 in. 2.54 cm, and 100 cm 1 m. 25) 10 ft to meters 26) 18 ft to meters 27) 50 yd to meters 28) 1 yd to meters Solve each problem. 29) The average length of goldfi sh ranges from 2 to 18 inches, depending on the variety. Find the length, in centimeters, of an 18-in. goldfi sh. (www.petco.com) 30) Marcia measures the length of her walking stride and fi nds it to be 26 in. How many centimeters is this? 478 CHAPTER 7 Measurement and Conversion www.mhhe.com/messersmith
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