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). (a) estimate the values of ft(−15, 30) and fv(−15, 30). (round your answers to two decimal places.) ft(−15, 30) ≈ fv(−15, 30) ≈ what are the practical interpretations of these values? when the actual temperature is −15°c and the wind speed is 30 km/h, the apparent temperature by about °c for every degree that the actual temperature rises. when the actual temperature is −15°c and the wind speed is 30 km/h, the apparent temperature by about °c for every km/h that the wind speed increases. (b) in general, what can you say about the signs of ∂w/∂t and ∂w/∂v? for a fixed wind speed v, the values of the wind-chill index w as temperature t increases, so ∂w ∂t is . for a fixed temperature t, the values of w decrease (or remain constant) as v , so ∂w ∂v is . (c) what appears to be the value of the following limit? lim v → [infinity] ∂w ∂v =