The wind-chill index is used to describe the apparent severity of cold weather combined with wind. The apparent temperature W has been modeled by the equation W = 13.12 0.6215T − 11.37v0.16 0.3965Tv0.16 where T is the actual temperature in °C and v is the wind speed in km/h. Suppose it is currently −15°C with wind blowing at 30 km/h. If the temperature is increasing at a rate of 1°C per hour and the wind speed is increasing at a rate of 2 km/h per hour, compute the rate at which the apparent temperature is changing. (Round your answer to two decimal places.) Incorrect: Your answer is incorrect. °C/h
