jmc

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 $$(\text{wind chill})=(\text{air temperature})-0.7\times (\text{wind speed}),$$ where temperature is measured in degrees Fahrenheit ${(}^{\circ }\text{F})$ and the wind speed is measured in miles per hour (mph). Suppose the air temperature is $36^{\circ }\text{F}$ and the wind speed is $18$ mph. Which of the following is closest to the approximate wind chill?