Question: The wind-chill index W is the perceived temperature when the actual temperature is T and the wind speed is v, so we can write W

The wind-chill index W is the perceived temperature when the actual temperature is T and the wind speed is v, so we can write W = f (T, v). The following table of values is an excerpt from Table 1 in Section 14.1. Use the table to find a linear approximation to the wind-chill index function when T is near 215°C and v is near 50 km/h. Then estimate the windchill index when the temperature is 217°C and the wind speed is 55 km/h. Wind speed (km/h) 50 60 30 40 70 - 22 - 10 - 18 - 23 - 23 - 20 - 21 - 15 - 24 - 26 - 27 - 30 - 30 - 29 - 20 - 35 - 37 -

Wind speed (km/h) 50 60 30 40 70 - 22 - 10 - 18 - 23 - 23 - 20 - 21 - 15 - 24 - 26 - 27 - 30 - 30 - 29 - 20 - 35 - 37 - 30 - 33 - 36 - 34 - 37 - 25 - 39 - 44 -43 -41 -42 Actual temperature (C) 20

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