Do i divide or subract

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 52°F and the low temperature for the same day was 36°F, what is the number of heating degree days?

13
109
44
21

Question

Do  i divide or subract

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 52°F and the low temperature for the same day was 36°F, what is the number of heating degree days?

13
    109
    44
    21

anonymous · Answer

srry i cant help right now, im in the middle of a test, srry

anonymous · Answer

average 52 and 36 and insert in the given formula