31) A 9-kg bag of cat litter weighs approximately how many pounds? 32) A bag of dry dog food is available in a 15.5-lb bag. Approximately how many kilograms is this? 33) A dishwasher earns an Energy Star rating if it uses less than 5.8 gal of water per cycle. Does a dishwasher that uses 21 L of water per cycle qualify? (www.energystar.gov) 34) Mehdi’s luggage weighs 23 kg. If the airline charges an additional $25 to check a piece of luggage that weighs over 50 lb, will he have to pay the extra money for his bag? 35) To conserve water, Mark installs a new, ultralowfl ow toilet in his home that uses 6 L of water per fl ush. The old toilet uses 3.5 gal of water per fl ush. How much water, in gallons, does the new toilet save per fl ush? Round the answer to the nearest tenth. 36) Janet’s top-loading washing machine uses 28 gal of water to wash a medium-sized load while Trisha’s front-loading machine uses 50 L. Which machine uses less water, and by how much, in gallons? Round the answer to the nearest tenth. 37) Jeremy searches a fi eld with a metal detector and fi nds a pure gold nugget weighing 18.7 g. If the price of gold is $925.00 per ounce, how much is the nugget worth? 38) Ysela’s wedding band contains 8.4 g of platinum. If the price of platinum is $1713.00 per ounce, how much is the platinum content worth? Objective 2: Understand the Relationship Between the Fahrenheit and Celsius Scales Determine which Celsius temperature is appropriate for the situation. 39) On a snowy day, the temperature outdoors is ______. Choose from −4C, 8C, and 30C. 40) Hot cocoa is best served at ______. Choose from 10C, 46C, and 100C. 41) To bake a casserole, the oven temperature might be ______. Choose from 30C, 200C, and 375C. 42) A hot tub might have a water temperature of ______. Choose from 10C, 35C, and 80C. 43) If the outdoor temperature is 29C, choose clothing best suited for this temperature. Choose from a T-shirt and shorts, jeans and sweater, heavy coat and gloves. 44) Is a temperature change of 10C equal to a temperature change of 38F? Explain your answer. Objective 3: Convert Between Fahrenheit and Celsius Units 45) Explain how to change a temperature from F to C. 46) Explain how to change a temperature from C to F. Perform the following temperature conversions. Round to the nearest degree. 47) 41F to Celsius 48) 95F to Celsius 49) 82F to Celsius 50) 34F to Celsius 51) 104F to Celsius 52) 45F to Celsius 53) 72F to Celsius 54) 61F to Celsius 55) 20C to Fahrenheit 56) 85C to Fahrenheit 57) 73C to Fahrenheit 58) 6C to Fahrenheit 59) 25C to Fahrenheit 60) 55C to Fahrenheit 61) 9C to Fahrenheit 62) 2C to Fahrenheit Mixed Exercises: Objectives 1–3 Convert to the indicated unit. Round the answer to the nearest tenth, if necessary. 63) 75 ft to meters 64) 12 gal to liters 65) 14 1 5 oz to grams 66) 6.5 in. to centimeters 67) 9 L to quarts 68) 58 kg to pounds 69) 500 mL to cups 70) 200 km to miles 71) Silvia rode her bike 15 mi on the boardwalk at the beach. How many kilometers did she ride? Round to the nearest tenth. 72) The length of Gabriella’s walking stride is 26 in. How many centimeters is this? www.mhhe.com/messersmith SECTION 7.5 Metric–U.S. Customary Conversions and Temperature 479
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