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Wind chill, a measurement that reflacts the temperature that one feels when outside based on the actual temperature and the wind speed, was first introduced in 1939, and the formula was revised in 2001. If the outside temperature is `0^(@)F,` what is the approximate wind chill at 40 miles per hour based on the 2001 formula ?

Options

A. `-20^(@)F`
B. `-30^(@)F`
C. `-40^(@)F`
D. `-50^(@)F`

Answer

B

Explanation

The 2001 formula plot has a slight curve that straightens as wind speed increases. Extend the line to reflect this trend, once complate, draw a straight line from 40 mph on the x-axis to the extended 2001 formula plot (a straight edge such as an extra pencil will help). Thten draw a horizontal line from the intersection of the 2001 formula line and the vertical line to the y-axis, you'll see that the corresponding wind chill is `-30F^(@).` (B) is correct.