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Mathematics 7 Online
OpenStudy (anonymous):

In order to evaluate energy demand for heating services, the number of heating degree days are calculated. The number of heating degree days can be calculated by the formula H = 65 - T, where 65 is degrees Fahrenheit, and T is the average of the high and low temperatures for the day. If the high temperature for a day was 54°F and the low temperature for the same day was 36°F, what is the number of heating degree days? A. 110 B. 11 C. 45 D. 20

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