The temperature falls from 0 degrees to negative 12 and 1 fourth degrees in 3 and 1 half hours. Which expression finds the change in temperature per hour?

The change in temperature is −12¼ − 0 = −12¼ degrees, or −49/4 degrees. The elapsed time is 3½ hours, or 7/2 hours. To find the change per hour, divide the temperature change by the time: (−49/4) ÷ (7/2). This is choice C, “negative 49 fourths divided by 7 halves.”

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