Wind chill is a measure of how cold people feel when exposed to wind outside. A good estimate for
wind chill can be found using this calculation:
(wind chill) D (air temperature) – 0:7 (wind speed),
where temperature is measured in degrees Fahrenheit (ıF) and wind speed is measured in miles per
hour (mph). Suppose the air temperature is 36ıF and the wind speed is 18 mph. Which of the
following is closest to the approximate wind chill?