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Mathematics 5 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 50°F and the low temperature for the same day was 43°F, what is the number of heating degree days? A. 15 B. 46.5 C. 111.5 D. 18.5

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